The new-to-me 3rd T-C Pennsylvania Hunter had a problem: I had to lift my head off the stock to line up the sights. I had thought about putting some type of pad on the comb, but then remembered reading long ago about steaming the stock to alter it. So, I put on a large pan of water to boil, lay the wrist of the stock over it, covered the stock and pan with aluminum foil to seal the steam in, lay a folded towel over top of that and let it sit on the burner for, IIRC, 30 minutes:
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I then clamped it in my Workmate vice and tightened that down as tight as I could get it:
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and left it overnight. The next day I reassembled the rifle and it formed the stock enough that I can keep a good cheek weld.
A word of caution: I should have put a block between the vice jaws and the the stock at the tang. It broke a small piece of wood off the inlet for the tang. I didn't notice that until I was putting it together again, and by that time the sliver had disappeared in my garage/shop.
Otherwise this worked well for me.
~Kees~