Firewall
 

Can anyone tell me what goes in this threaded hole in the firewall?

Re: Firewall
 

I believe there is a "C" clip inside that holds the speedo cable. It threads into the "D" nut in question.

Re: Firewall
 

TB is correct. Uses a 12-24x1/2" round head screw & lock washer.

Re: Firewall
 

Thank you, I was thinking it may be a clamp but I was not sure.

Re: Firewall
 

Speaking of holes in a firewall, my 1929 Coupe has so many extra holes that were drilled in it over the years it looks like a sieve in places. Any good ideas how to fill those holes without a lot of work? I can't remember for sure how I filled all the extra holes in my dashboard....I think I used JB Weld, sanded and painted.

Re: Firewall
 

Well the proper way to fix any hole in metal is to weld it, or braze or lead it. But I guess it doesn't matter as long as it doesn't leak...