As a continuation of the above,, cuz I am a dummy and sent before finishing.. DUH! me..
(even MODs can be stoooopid)

B&B does do a full line repair on most USEngines products and has a decent suppply of
parts to do repairs with,, in stock... The 25cc has been out of production for many years
due to a lack of sales and the 35 was dropped leaving just the 41.. The basic difference
of the 35 and 41 is bore size.. All three were of the same basic casting and were
of same basic weight...

USEngine aquired Quadra a few years ago... With USEngines ceasing production the
Quadra line has now gone back to the original producers and are again being produced...