Cutaway,

Was this the first Schneurle 40, from about 1970, with an aluminum cuff/spacer between the lower case and head, or an earlier baffle piston 40?

I have no personal experience using it but a friend, back then, liked the hefty 40 I describe - if he could get the head on straight. Torquing was a bit more demanding, with that sorta soft aluminum cooling-fin stack in the middle of things...

Interested to see what you've turned up, here...