Another way to keep your Gauntlets tight is to do what they did for the Movie, use a pin closure system. An easy way to make one is with some strip-hinge, like the one seen joining Jango's Gauntlet-halves. Place the hinge inside the closed Gauntlet & glue the hinges one to each Gauntlet side. Remove the hinge's center rod & replace it with a threaded rod. Place a nut for the threaded rod at the wrist end of your closure system. I could go on, but you probably get the idea.
Cheers Jono!