A simple "fitting" procedure with your new replacement will pretty much insure it'll never happen again.
You can leave the cylinder out but install the base pin and, of course, your new transfer bar.
Cock the hammer then pull the trigger. Hold the trigger back while inspecting the hammer's position in the hammer well.
Slowly release the trigger, allowing it to move forward to it's "at rest" position. Watch the hammer while doing this. If the hammer
moves deeper into the hammer well then the transfer bar is "pinched". The face of the New Model hammer has a couple of "steps".
You need to file the "transfer bar" step deeper and try the test again. Continue until the hammer does NOT move during the test.
Voila! The transfer bar is no longer pinched between the hammer and the hammer well when firing the New Model.
JMHO,
flatgate