Wish I could answer this and help but I don't think I fully understand the problem. Are the wipers binding, or are the transmission cables falling off the wiper posts inside the car?
A long time ago I did lubricate the wipers on my 56 from outside the car by just dribbling some pb blaster on top of the posts and letting it run in, then running the wipers. I don't know if this will help.
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John C. De Fiore BCA # 3757
56 Super 56R Purchased 1974
69 GS 400 Convertible Added in 2003
69 Electra Limited 2 dr.( well, no longer limited although still unique) Purchased in 1995 or thereabouts
78 Estate Wagon added 10-2008
95 Riviera Supercharged (sold) 2006
06 Lacrosse CXL
"I wonder if I can get the Feds to bail out my old cars?"
Member of the UPSTATE NY CHAPTER
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http://unybca.skyphix.com/