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Half a hole is still a hole, so the answer is five!
None
Art Wall Jr. had 44 hole in ones in PGA Play.
12
4.5
He had 17 hole in ones.
5
Arnie had 16 hole in ones in offical tournaments but he also had a few more that were not during tournaments.Believe his total is 18 or 19 holes in one,
Not a single one - but possibly many small ones.
Depending on the model, the rotor may not contain a jackscrew hole. For ones that do, they're usually the same thread size as the caliper to bracket bolt (M8-1.0).
34. And, with the exception of his putter, he hit a hole-in-one with every club in his bag.
That depends on which hole. Shorter holes will have more common hole in ones than long ones. In general, still very rare.