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From Wikipedia Annealing (metallurgy)




I would use a propane/map gas plumbing torch to heat the brass and quench in water.

When you next get pinning stock ask if it was hot formed or has...

Looking back through the photos I noticed that both heads have cracks. You should try annealing the rod stock. It may be overly work hardened. As that could also be causing some of the difficulty.
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Nice scales, and mod.

I took a key-less chuck off a yard sale drill. To slip the rod stock through the chuck and tighten it down at a convenient height, and proceed to make the first head....