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The simplest fix for cap jams is to fill in that safety notch on the hammer face. Brazing or welding would be best but I have used JB Weld on mine and I rarely get caps under the hammer any more. The split caps get jammed into that cutout and then the hammer pulls them off the nipple and they drop into the action. With a smooth hammer face the cap may get blown back a bit but it doesn't stick to the hammer and get pulled off. Any replacement nipple with a smaller flash hole will help too. If you fill the notch then you can't use the safety pins between the nipples on the back of the cylinder to hold the hammer. You'd best just load 5 chambers and rest the hammer on the empty one. I've seen ASM & Pietta Colt clones that don't even have the safety pins but still use a hammer with a notch for them.