many people put rivets behind these caps, on some armors they are part of the belt plastic.
you should be able to get a set of caps from TM or john danter in the UK.
I take a different path when I assemble my belt-
drill a small hole at each point where the caps go, and use a screw post to assemble them.
I glue the cap to the top of the screw post with epoxy and then put the cap through the belt.
the main reason for this is that you can remove and change up your belt's canvas, and switch up your
way of trooping from different films.
for ANH you switch belt and holster and blaster, and ESB you also change belt and holster and blaster.
making this part with screw posts is key to making it easy to switch it up!
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Black TX caps shown untrimmed and ready for epoxy. you usually have to coat the top of the
metal before gluing, as some kinds of glues can warp plastic when metal is present.
DONT USE e-6000 for this!!
from the looks of it you're also going to have to purchase a canvas belt.
TK 4510 is your best bet on this part!