On Mon, 11 Mar 2019 16:30:12 -0700, MOP CAP wrote:

I recently salvagd the shaft from $1 fles market putter for another
purpose. The head is very heavy for its size and nonmagnetic.
What type of alloy or metal is it? [...]

A few kinds of stainless steel are used in golf club heads (see eg
https://www.hirekogolf.com/clubheads-material-differences) but it
looks like all of those mentioned there (17-4, 431, maraging) are
martensitic and magnetic. Zinc putter heads are mentioned near the
end of the page, and are a good possibility for a $1 putter. Zinc
is a little less dense than iron but significantly softer. If it's
zinc you could easily drill it, or carve shavings off.

--
jiw