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The Eveready Minilight (discovered by mecroid over at TDH) was used as some kind of torch on the front part of the Boba Fett right gauntlet. This piece was fully functional on the Supertrooper/Pre-Pro #1 suit, and was present on most of the ESB era suits. The ROTJ didn't had these installed.
The images of the printed model were posted by 01Hawk over at the TDH forums and I posted them here with his permission.