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umop3pisdn-
I don't know what peening is.
I used a two fluted ball nose to machine the dimples. The test shows me that I need to pilot a bit first with a spot drill as the holes are not completely round. Will do some more testing.
I also need to figure out if want to this free handed or if I need to spend on an indexing chuck to get accuracy...
Hulsroy
Warmed up this morning with a tiny test. I am definitely doing this to a head tube