quick question,

Ive got an OM606 also, and it had a removable TDC pointer, in order to service the water pump it needs to be removed, I did the water pump not long ago and had to remove the bracket, I had put some marks on it but were grease pencil marks - and they washed away (because I literally wash everything I open up with solvent) - I tried my best to align it to the worn out depression (scratches) the mounting screw had left on it.

now how can we determine TDC again at this point? i.e. if I would want to check chain wear.. or for any other job that requires TDC to be set.