Speedometer cable delete doohickey on the spare parts airhead, take 2.
I found an old 4 speed /5 gearbox that I think was acquired from @almondjoysgotnutz a long, long time ago (2014?) in a land far, far away (Atlanta).
Anyhoo, if the stock little hollow M6 ground strap bolt works swell as a breather, 6 radially drilled 3/32" holes should do just fine. If water intrusion becomes a problem, a few of them might get a wipe of epoxy.
Soundtrack by The Buzzcocks.
#20thcenturycycles #keepoysterbayweird #bmwr90 #bmwairhead #grimeca #grimecafourleadingshoebrake #monarch10ee #billyjoel