OK, no groove. Now I know where I am starting from, and I can measure how much this one has worn.
TDC tool should be fairly easy to make on a lathe. I will post later about how easy ( or not ) it is to use.

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andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles