I once lost the tach drive on my 70 triumph. Pulled into a buddy's to try to fix the spewing oil so I could get her home.
We popped a bottle of Chimay and I used the cork to stop the leak. After riding it like that for a while (lost the tach drive couldn't find another) I got to liking it and it was working just fine. So I safety wired the cork to a push rod tube (so if it fell out on a ride, I'd still have it - never did fall out) and drove it like that for several years. You could always tell the beer connesieurs in the gawkers as they'd always comment on the fact that a Chimay cork had been used.
Good times, good beer.
Rj