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I do a finish similar to Dave, but I find that thinning epoxy with solvents causes long term issues in adhesion and color. I choose to first heat the handle to a point where it is warm, but still...

There is some truth to swollen wood and flaking finish. Its a small surface and you should use a couple of coats at least.

There is nothing wrong with wood hardener. It is not a true stabilization...

I use poly like jeff, but I also use epoxy, CA and acrylic.
The most difficult is acrylic and I don't suggest it.
CA is easy and relatively consistent. Look online there are many places that go...