Re: Hole saw
I know of the type of tool you are looking for, but hopefully it might not be necessary for a 59A with the stock iron heads. They were popular when aluminium heads were more common and they had lots of problems with dissimilar metal corrosion.
That said, the last 59A I pulled the heads on was a proper swine, but I did get them off. You can fabricate a pair of pullers using scrap spark plugs and some long bolts. Two pieces of plate to span the studs and at least you're in with a fighting chance.
The hole saws, if you could find one, would leave you with oversize holes in the head.
Mart.
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