Building stop to check TDC

Knock the ceramic insulator off of and the guts out of a spark plug.
Weld a nut on the base for a piece of “all tread” or “treaded rod” to screw into it for your adjustable stop.
Then follow 1969Swingers instructions making the dimension smaller and smaller till your find TDC.
Maybe that makes sense.
No more time tonight.
Happy New Year!
:clock: