I was overcome with camera envy so just bought one with film on ebay. The seller seems to use HIT cameras a lot and added this useful info:
Mine's coming with this film: Size 00 rollfilm Eastman PLUS-X 100, (DIN 21) process-by dated 11/2011, for the HIT and compatible subminiature still cameras.
HOME PROCESSING. Eastman Plus-X can be processed in any black & white negative processing chemistry: HC-110, Microdol-X, Dektol (1:10), D-76, X-Tol, etc. Use at least 5% less time than the manufacturer's time recommended for 35mm. You won't be able to find a 17.5mm reel, and you won't need to. This is 16mm single-perforated film wrapped in the 17.5mm paper. The 14mm square image will fall just to the side of the perforations. If you see some perforation on the edge of one or two frames, they will be cropped out by your enlarger or scanner mask. My developer of choice is "MIXER" my Technidol-mimic (at 1/10th the price): In 200 ml. water, add 21 drops HC-110 (stock), plus 19 drops Agfa Rodinal. Agitate 5 secs. every 30 for 19mins @ 68F. For Minox tanks the ratio is 17dps. HC-110, plus 15dps. Rodinal, in 75ml water. Enjoy.
D-76 B & W NEGATIVE FILM DEVELOPER
Water...........................750cc
Elon...............................2.0 grains
Sodium Sulfite, (des)..100.0 grams
Hydroquinone................5.0 grams
Borax, granular..............2.0 grams
Cold Water to make.......1.0 liter
For Plus-X, dilute 1:1. 8 mins @68F. Agitate 5 secs. every 30. 2 min water stop-bath. Fix per mfrs. instructions.
--- this is just an excerpt, he writes a whole lot more about processing and the camera itself but I thought it was too much to post here..