Because of some health problems I didn't run my engine at all last year.
This season I plan on putting a little Marvel Mystery Oil in each
cylinder and turning the engine over by hand before starting it.

I figure I can make a simple crank with some pipe, a few elbows and a
dremmel tool.

The question is -- what is the ID of the hole the crank goes into on an
A-4. The sailnet A4 list seems to be down for the weekend