Re: 55-56 square holes in rear fenders

Posted by HH56 On 2016/12/14 22:27:48

Quote:
I know. I've used both types many times. The question was why the square hole in that fender location and was there a special clip or nut used.

Most of the Tinnerman or speed nuts we are familiar with today just clip over a straight edge or are just a flat rectangle which lays over an opening. Usually there is a simple hole in the metal so the screw can go thru that hole and into the nut for maximum support. Those wouldn't require a square hole and a smaller round hole would probably be easier to punch or drill. In fact, the square hole makes installation more difficult for the clip on type. It is also a bit weaker when using the clip on type because one side of the nut is not well supported.

Randy has a good question. Did Packard use something not found as easily today or just use the flat type and hold them in position over the square by tape or some other method while the screw was inserted? That was the method they used on some dash speed nuts where access to the nuts was restricted