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1930 dash knob removal


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#1 West Peterson

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Posted 14 April 2008 - 12:56 PM

I have a perfect-condition 1930 dash knob (marbelized amber color) that is stuck to a cut-off and rusted shaft. I've tried soaking the whole thing in a jar of PB Blaster for more than two weeks, but still have not been able to remove the plastic knob. Apart from cutting the shaft at the end of the plastic, and drilling the rest out, is there anything else I can try?
I've thought about soaking the whole thing in Coca-Cola (remembering my sixth-grade experiment of dropping a paper clip into a glass of the solution). Or, possibly a well salted solution... or even some type of acid. However, i do not want to ruin the knob, as it is so nice. Reproductions are no where near as nice.

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No man treats a motorcar as foolishly as he treats another human being. When the car will not go, he does not attribute its annoying behavior to sin, he does not say, "You are a wicked motorcar and I shall not give you any more petrol until you go." He attempts to find out what is wrong and set it right. – Bertrand Russel

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#2 Restorer32

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Posted 14 April 2008 - 01:09 PM

You might try heating up the remaining stub gradually until hot enough to pull out, then rethread or Helicoil the knob.
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#3 Rusty_OToole

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Posted 14 April 2008 - 01:42 PM

Are you sure it is supposed to come off? Some knobs were molded onto the shaft.


#4 West Peterson

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Posted 14 April 2008 - 01:47 PM

No set screw. I'm pretty sure it's supposed to scew off, but I base this on knowing that the dash-light knob screws off. The knob I'm having trouble with is for either the choke or spark, so perhaps Tom or Rick can varify its attachment.

West Peterson, Editor
Antique Automobile (AACA)

No man treats a motorcar as foolishly as he treats another human being. When the car will not go, he does not attribute its annoying behavior to sin, he does not say, "You are a wicked motorcar and I shall not give you any more petrol until you go." He attempts to find out what is wrong and set it right. – Bertrand Russel

"Things are more like they are now than they've ever been!" – Uncle Arni


#5 mrpushbutton

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Posted 14 April 2008 - 02:13 PM

perhaps someone on the forum has a broken or runied knob they can dissect and tell you how it is on there?
John

The real pity in America is that the people who really know how to run the country are all tending bar and cutting hair--George Burns

#6 West Peterson

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Posted 14 April 2008 - 02:17 PM

I guess that weather it's screwed on or molded on, I'd like to know if there is any way of eating away the metal without harming the plastic (is it plastic?).

West Peterson, Editor
Antique Automobile (AACA)

No man treats a motorcar as foolishly as he treats another human being. When the car will not go, he does not attribute its annoying behavior to sin, he does not say, "You are a wicked motorcar and I shall not give you any more petrol until you go." He attempts to find out what is wrong and set it right. – Bertrand Russel

"Things are more like they are now than they've ever been!" – Uncle Arni


#7 Speedster

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Posted 14 April 2008 - 02:20 PM

The '29 choke and spark knobs are metal, not plastic, but they are threaded and screw on (normal right-hand thread). So, it does seem logical that '30s knobs were threaded also.
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#8 Speedster

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Posted 14 April 2008 - 02:26 PM

In '30 there were also plastic knobs on the 2 gloveboxes. Could it be from one of those? The glovebox knobs may Not have been threaded on to shaft, since they would have a nut on inside?
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#9 Rusty_OToole

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Posted 14 April 2008 - 05:15 PM

I was thinking about the headlight switch knobs used on many cars from the 40s 50s and 60s. Where the knob was molded onto the shaft, and the shaft pushed into the switch where it was held by a snap ring or otherwise locked in.

Someone who did not know this might cut the shaft when he couldn't get the knob off.

Have seen this type knob, screw on knob, and set screw knob all on the same dash board.

#10 34PackardRoadsta

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Posted 14 April 2008 - 05:15 PM

The choke and spark knobs on my 30 are plastic, and they look screwed on. I have not tried to take them off.

You could try using galvanic corrosion to remove the metal. Place some salty water in a copper tub (3.5% table salt will work). If you don't have a copper tub than a plastic tub with a flat chunk of copper immersed in the water will do. Attach your metal post to the cathode of a 12V battery using a copper or stainless connector, and immerse in the tub. The tub (or chunk of copper) is then grounded to the anode of the battery. Current enters the electrolyte through your piece of metal, travels through the electrolyte, and goes to ground through the copper. 12V DC at very low amps will result in dissolution of 1/2 lb of metal in less than a day, so it shouldn't take long with your post.

Just don't use tin or aluminum for the cathode (e.g. bucket). You will just end up with salty water all over the floor!

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#11 mrpushbutton

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Posted 14 April 2008 - 06:23 PM

Here are a couple of images to help this discussion along.......

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John

The real pity in America is that the people who really know how to run the country are all tending bar and cutting hair--George Burns

#12 Speedster

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Posted 14 April 2008 - 06:40 PM

What is the knob for, on right side of dash above cigar-lighter? Is that the Heater-switch, dash-light switch or what? The '29 doesn't have a switch there.
What ever it is, it has a plastic knob also.
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#13 Packin31

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Posted 14 April 2008 - 07:15 PM

On my car that is the Map light.
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http://s153.photobuc...[/SIGPIC]<br />

#14 West Peterson

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Posted 14 April 2008 - 07:30 PM

Yes. Map light.

West Peterson, Editor
Antique Automobile (AACA)

No man treats a motorcar as foolishly as he treats another human being. When the car will not go, he does not attribute its annoying behavior to sin, he does not say, "You are a wicked motorcar and I shall not give you any more petrol until you go." He attempts to find out what is wrong and set it right. – Bertrand Russel

"Things are more like they are now than they've ever been!" – Uncle Arni


#15 Speedster

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Posted 14 April 2008 - 08:08 PM

Map-light! Man, How Modern can you Get! <<GRAEMLIN_URL>>/shocked.gif <<GRAEMLIN_URL>>/grin.gif

No Heater standard, but it HAS a Map-light! <<GRAEMLIN_URL>>/smirk.gif <<GRAEMLIN_URL>>/grin.gif
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#16 Packin31

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Posted 14 April 2008 - 08:21 PM

It is a neat thing. You pull is out in it lights up <<GRAEMLIN_URL>>/smile.gif
Tom
Woodridge, IL
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http://forums.aaca.o...ion-213384.html
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#17 34PackardRoadsta

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Posted 14 April 2008 - 08:23 PM

Or in my case, sparks a bit! Or it did before I disconnected the wire!


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#18 R W Burgess

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Posted 14 April 2008 - 08:25 PM

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body"> Or in my case, sparks a bit!</div></div>

....Comes in handy for the Fourth of July Events! <<GRAEMLIN_URL>>/whistle.gif

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