dunno Goose, ive never done it seems like you just put it in a lathe and machine it with carbide or use a surface grinder
is it up the right way yet Carl ?
bit of stuffing around to get the starter to fit, moved holes in the bracket and filed the case down. do you like the black hammertone finish ? its called toasted motul with FCR tint
welded a 7/8" nut over the drainplug
carb adapter specially made with proper carb alignment for the 650 cases, Mopwer and i did the design, he was able to print out a few different ones with STL rapid prototyping
smooth transition and an oring grove, i didn't use the oring just 3bond
Mopwer wanted one in 40mm so made a few of those,
with cnc its dumb not to make more than one
these were out of a 20mm sheet which left the base thinner than I think is proper so ive given them all away bar one 40mm one.
if these are something people want i can do a run of 10 or so from 25mm sheet with a thicker flange, they are for the 650 cases only.