Re: [VAC] Hubcaps and Lug bolts

[Rob Super <rms@xxxxxxxxxx>]

 Current standard is to produce L-threaded nuts and bolts with notches in 
the lands of the head--if cut deeper they'd form a groove all around the 
middle of the head. They're used for safety reasons--helps reduce the 
chance of a wheel rotating in that direction working loose, prevents 
hooking the oxygen tank to the acetylene regulator, etc. Also found on 
common propane tanks and at least some European cars like older Alfa 
Romeos. Didn't realize they were ever used on American cars--and now I 
can't remember what's on our '73 AS--guess I'll have to run outside and 
check!


Rob