The more I think about this - the more crazy it gets. A MANUAL pulse generator is exactly that - MANUAL. It allows you to step ONE pulse or MANY pulses under precise MANUAL control. That's it's whole purpose in life.

Earlier, with an electric drill attached. That makes it no longer MANUAL. The MPG became a means to an end. When you pulled the drill trigger, you might just as well have turned a pot.

The MPG is just becoming a distraction. Everything that everyone has suggested (even Irving with the ONE pulse per rev) is battling against the MPG's natural behavior. Whatever ANYONE comes up with it will no longer behave like an MPG - so why have it in there at all?

I reckon your back to the 555.

Sorry - short and to the point - I'm drinking here...