As you know, I'm rebuilding Kyoko's engine and I came across a problem with the flywheel. There are 3 shims that go between the flywheel and the crankshaft's #1 bearing that set the end play of the crankshaft.
It seems that the flywheel I have doesn't have enough clearance for the 3 required shims (as per VW's instruction, and who am I to go against over 60 years' worth of engineering knowledge?) as the thinnest shims I can get are around .0095" (.24mm).
After poking around on thesamba.com and not really getting a definite answer (it always seems there's so many people with so many contradicting ways of doing things ...) I decided to fire up the milling machine and take off 0.010" to make the necessary amount of clearance (3 x 0.095" = 0.0285" thickness, and non-machined clearance is 0.028", and required clearance is 0.004" to 0.006" ideally).
Here I am, about to either resolve the clearance issue or turn a nice shiny flywheel into 16lbs of scrap metal.
Well, it worked. I fly-cut off 0.007" and now have about 0.005" clearance, right in the middle.