A question about some 3X plugs

Don/WI said:
I have a set of four 3-X that I believe are production also, but the 3 has a rounded top. Would it be possible to reproduce the bottom with the correct knurl? Can some-one tell me what the pitch is for the knurl around the base? Thanks. Don/WI
Click to expand...

Vince put a good looking knurl all the way to the bottom. He had it pictured on Shelly's Fordbarn a couple years ago.
 
Knurling

Here is my attempt at knurling a reproduction plug.

Bob
 

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