[ QUOTE ]
M10 X 1. Maybe a bolt with a hole tapped into it for 1/16 NPT? Or maybe modify a bad glow plug? /forums/images/graemlins/thinking.gif
[/ QUOTE ]
Did the glow plug thing.
Save your time and just buy the adapter from Matco for $15. The compression gauge and adapter run less than $80 IIRC. Wish I had went that route, would have saved lots of time. I bought my compression gauge from a parts store, don't recall the price. At that time I not even though about Matco, they are much cheaper than Snap-on for the compression gauge.