There's also the option of going to an 18mm hole and using a small block Chevy spark plug. I did that on an 066 once and it ran for years that way, until the Yarder got pulled over and smashed it flat.Hey thats great i will look around for ez loks and some eversize inserts. Thank you guys for the info.
The thing is, people tend to hang onto good 2100/2101 jugs.