C2 seat back release 67
Help, I had my seat back releases rechromed back in the mid 90's on my 67, & just discovered while unpacking them that the plater did not return the set screws that retain the release handle to the seat back. This is a restoration that was put on hold during children's school & college years and has now resumed. What type of set sccrew was used? I'm thinking that it was a slotted one. All I can find at fastener stores are the allen head type. Anyone have a source for the correct ones or have 2 laying around collecting dust
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Re: C2 seat back release 67
Al,
I was almost positive I posted about this subject before, but I can't find it in the archives at the moment. If you check Adams page 383 you will find the drawing for the seat lever (knob assembly). It calls for a set screw that is 1/4-28. The caption above the drawing says that early knobs used #8-32 set screws. The car I'm working on was built Jan. 11, 1967 and has the 1/4-28 set screw. It is slotted, no real "head" just a slot cut into the top of the threaded shaft, with a cone tip. -
Re: C2 seat back release 67
Scott, the lever on mine has a 1/4 X 20 hole. It's 3rd week Feb. 67. original to the car. Is it possible different venders used different sized screws? I may try making 2 from screws and csuuing a slot with a saw??Comment
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Re: C2 seat back release 67
Al,
I just checked mine with a thread gauge tool, the set screw will begin working into both 1/4-20 and 1/4-28 holes, but screws in further on the 1/4-28 before meeting resistance. Using the other end of the thread gauge (bolt end), screwing it into the seat back lever knob hole, again both 1/4-20 and 1/4-28 will begin to screw in, but the 1/4-28 goes a bit further before resistance. I didn't want to force either one and risk stripping the threads.
The following link shows the differences between two different types of knob assemblies, both part number 3903570, but one with a much smaller screw. The photo is in post #11. It looks like the #8-32 set screw style was the service replacement, or at least one possible service replacement: https://www.forums.ncrs.org/showthread.php?t=60133&highlight=3903570&uid=4669Comment
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Re: C2 seat back release 67
Al and Scott,
I am working on the restoration of my very early 67(# 179) and just this week started on the seats. I have owned the car since 1969 and don't recall replacing the seat release handles but it is possible that I replaced one or both at sometime back in antiquity. Anyway one of the handles has a much larger set screw than the other. Both have the same part number "3903570" on the back however the one with the larger set screw has a large perpendicular number "2" before the GM part number and the one with the smaller set screw has a large perpendicular number "1" after the GM part number. I have no idea what these extra numbers mean or if one of the handles was original which one that would be. Have you seen what the repops look like?
NealComment
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Re: C2 seat back release 67
Neal,
I have not seen what the reproductions look like. I checked my original levers and they both have the part number (3903570) cast in raised numbers on the back side and both also have the number "1" perpendicular to the part number and to the right of (after) the part number, near the tapered end of the lever. As noted above, both of my levers have the larger 1/4-28 slotted set screw.Comment
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Re: C2 seat back release 67
Hi Neal, I have 1 with the ! on it & 1 with a 2 on it. Both use the large slotted set screw 1/2-28. Hey Scott, I did locate my original set screws!!Comment
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