These are called Well nut's. The rubber goes in a hole & when the machine screw is tightened down it swell the rubber to tighten it in the hole. This protect's the regulator from distortion & vibration.
Like previous said you must have a ground wire.

Last edited by Wrenchbender Ret.; 09/20/2010 9:45 PM. Reason: Forgot ground
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum