M. Requin

jpitman is correct, this is a knuckle, not Acme, thread. Very few folks are familiar with it, so it is not surprising it was mislabeled by someone, even a "specialist". I can cut Acme threads on my lathe- simple stuff. I do not have a knuckle thread insert nor have I ever seen one.

Jetdriver69

Ok Im wrong, just repeating what the bolt guy told me. Regardless, I DO NOT want a license plate up front and am getting an antique registration plate for my 82. Problem solved and very cheaply at that.

M. Requin

I completely agree with that!

M. Requin

So I just had to find out how little I know and googled "knuckle thread insert", and now I have seen one, actually a bunch, at least in web images. I've fallen off horses before, including some high ones...

The Fixer

Tow hooks on my 2004 Cayenne S look identical to 928 units but thread is reversed. Odd.

jpitman2

Acme is an easy mistake to make, as there are not many threads at 8 TPI in the relevant diameter range. I have found about the only thread mix that can work for short lengths is M5 (p=0.8mm) will fit US thread 10-32, as 0.8mm pitch = 31.75 TPI. In soft materials (eg composite , probably alloy) up to say 1/2 long the force required to screw in is not high.
jp 83 Euro S AT 55k

tailpipe

Newer VW jettas have the same thread tow hooks in them just tried one here....

jpitman2

Jettas have the same thread ...as which 928 hook? The early small dia (.6"), or the later larger(.8") thread?

jp 83 Euro S AT 56k

beran earms

Could have obtained an extra stock hook and cut off what wasn't needed and then built off of that piece.