CrackStock said:
How comfortable are you in useing your hammerstall as a safety?
100% comfortable...adding a hammer stall only increases safety;
Do you believe that it might become removed in the woods as you walk?
No I don't...have never had one come off since I began using them a couple years ago...and I had mine made to be a tight, snug fit...even sent the guy a TC Frizzen as a template.
Or do you believe that the likelihood of a half cock notch failing is greater?
Personally I don't trust any ignition design like a bare percussion cap or bare frizzen/priming powder that is exposed to accidental direct contact by a falling hammer...whether accidentally falling from half-cock, or from full-cock, or from an accidental thumb slip while fiddling with the hammer...if there's no intervening safety barrier to prevent the igniton source from being struck directly, then that's a major exposure.
In fact, hammer stalls work so well that just yesterday afternoon I had a first time experience. I drew down on an 8 pointer, squeezed the trigger, and heard a strange, soft, dull sound instead of the rifle firing. I immmediately realized I had not removed the frizzen...it made virtually no noise and the buck didn't even look my way, I quickly recocked the piece, slipped off the hammer stall, and shot him...point of course is that I fired my lock with a primed pan and the hammer stall did exactly as it was designed to do...it stalled the hammer and didn't even open the frizzen.
My advice would be step into your back yard or next time at the range, prime a pan and just experiment with it a couple dozen times or so until you get comfortable, confident, on how it operates and it's reliability, etc.
Mine are good quality leather about as thick as a belt...I specified bone dry leather, not oiled leather, to ensure no oil could gradually seep onto the frizzen face.