[Amc-list] early american trunnion upper bolt

[Tom Jennings <tomj@xxxxxxx>]

John, you were right!

I'm making my own replacement trunnion bolt, nut, lubrication system and 
seals. Screw that old crap.

Literally every inch of both bolts had to be ground into dust to remove them. 
All I was able to preserve was one half-inch piece. I am not exaggerating. 
(While I think it's a lousy design, any maintenance at all would have left 
the car usable, clearly previous owners during the car's hey day were 
negligent.)

I have one little piece of it left. It looked funny to me, thread peaks were 
flat. When John Elle was over, he thought it looked like reduced diameter. 
That's exactly what it is...

The trunnion bolt hole is 5/8-11 thread, standard 5/8" NC, so's the bolt, but 
reduced to .590" OD. The nice chunk of chrome-moly threaded rod I bought to 
make replacements is .625" OD. Gonna chuck it up here on the school lathe and 
reduce it.

I think the reason for the reduced diameter is two-fold; one, it's 3" of 
threaded casting, and it's a lot of friction, reducing the OD lowers that but 
not overall strength (which is gross overkill anyways). Two, it's a half-fast 
(sic) way of allowing a bit of grease to get in there. Clearly that doesn't 
work very well!
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