The 501A is one of my favorite P-60 hosts, you can use 18350 batteries as well as 16340s and CR123s. Also if you use these tail caps they will tail stand or you can add an o-ring to the stock tail cap to get it to tail stand as well.
Thanks to everyone for their help. I had to attend to some non-light business so couldn’t get back to the thread until now. I will poke around and see which one of these will work best. Anything is better than what I started with, which was basically nothing.
Not the place for it as it will get lost, but the UV drop-ins manafont is selling these days are like HALF the light output of the ones they used to have. They work fine, but just are nowhere no-how no-way like the uv drop-ins they were selling like 6 months ago. They also have a crappy beam pattern, not the nice soft spot like the ones of yore. the new beam patterns have sorta like a “V” in the center instead of a round spot. Very odd. Yes, the reflectors are tightened down.
Glad I got two of the good old ones.
It’s not just a bad apple. I got four for friends, romans and countrymen who saw mine, and they’re all inferior to the old style.