I am working with another Marmon club member to recast the big 6 waterpump and thought it would be neat to reproduce the bush and washers as well.My thinking was that there were others that need them like me.I guess what I really need is to have a clear understanding of what the function of the ribs in the brass bush were as well as what their location was in relation to the waterpump packings and the brass washers.Having the width and height of the ribs would be nice.I am sure the Marmon engineers were a lot sharper than I am. I am just starting a ground up restoration of a 1927 E75 2 Passanger Coupe with rumbleseat. It is an untouched origional that was sold in WW2 to be used to power a sawmill and some how excaped destruction and has sat until a former Marmon club member sold it to me.It is all there except for a pair of Parabeam headlight lenses,the clock,and the latch locks and bezels for the rumbleseat lid. I even found a paper instruction label on the Marmon Self Lubricator that I am trying to reproduce for other Marmon owners. Part of the label was illegible and I am hoping another partial lable will surface.I also have the instruction label for raising and lowering the top for open cars, It is in perfect shape.All of the body wood is in poor shape and has to be completely replaced.I have the main rails all ready to cut out but I am a little neverous and will verify my measurements before I proceed.I do have an oldsmobile. In fact I have several: a F31 coupe,F34 coupe,1941 98 Convertible coupe,1941 78 Deluxe 2 dr sedan,1958 S88 2dr Hardtop,a 63 & 4 Starfire,as well as a 28,29,30 Olds for parts and a 54 Lincoln 2dr Hardtop for parts but should be restored. but that is not why I am called oldsobsolete. I have 5 to 6 semi loads of NOS oldsmobile parts,also other GM carlines as well as 800 NOS ford mldgs for 40's & 50's.hope this answers some of your questions. Regards, oldsobsolete