My Mag Charger holds 4x3, Sanyo 2700, AA for 5.4 Ah at 7.2 volts. Maha Powerx AAs are probably better from post I have read. The tube is bored with 4 channels, quad-bore. I use a mica shield, they were available from Litho123. It has not melted the socket yet. I am experimenting with ceramic blanket material in lieu of the mica shield, it seems to work too. I would prefer the ceramic slug but you see that they are not yet available (we are waiting on FM's next run!). I am also experimenting with a ceramic slug, built with tubing rather than milled. It definately is not a FM, but it will probably serve the purpose well. Necessity is the mother of invention!
I started this thread on Mag Chargers:
https://www.candlepowerforums.com/threads/132125
and FM posted and inspired me to go on and now I got a very usealbe light that sees service every night! I have another MC that is going through metamorphasis and I have a FM extension tube, it does allow making the same light without boring, you can get 12 AAs into the 74mm on the MC. It is also important to insulate the reflector. Older lights you can pop the reflector out, in the past I put them back into the frame ontop of fiberglass felt and that worked, now I am using ceramic blanket material. The new MCs have the reflector really glued in with some high temp stuff. I am able to pack ceramic blanket material behind the lower portion of the reflector.
I forgot to mention the 5761 is the same diameter as the ROP Pelican 3854, .377. You can enlarge the reflector port by using a round dremel type stone dressed to the appropriate diameter and running that into the port. A smooth FM MC reflector is choice if you can find one.
