FWIW, prime w/ 3F on the inside of the wheel (to the barrel) and I've shot up to or more than 40-shots in a row - no bound wheel or pan cover. Mine was built by Brian Anderson of VT.
If anything limits the reliability, it is the pyrite getting dirty, if not the pyrite integrity and/or quality itself. I have found that cleaning the pyrite with alcohol every six to dozen shots greatly improves the reliability. And for some weird reason the pyrite seems to last longer …
I also have experimented with various cleaning techniques and have done the ‘forced water behind the wheel’ approach and also a gun scrubber or brake cleaning aerosol, but only used outdoors. The lock assembly is then rinsed in water and left on a heated heat duct to dry or I will warm it in the oven or use a hairdryer or heat gun.
Then lube! All is swell! Oh, when I do disassemble it, I run any bearing surface with a construction pencil. The graphite appears to inhibit any crud build-up, plus improve cycling.
Works for me! And many thanks to Canute Rex for his help in my early ‘growing pains’ with this ignition type, especially for sources for good pyrite!