any rivet gun will do , diy shops sell em, if ye get one with a swiveling head even better , but not nessasery.
the rivets can be drilled out, all ye have to do is drill the heads off, the drill bit doesnt need to be as big as the rivet head , just big enough to drill the head away from the holding pin...
not to confuse ye
get a drill just a bit smaller than the rivet head
if ye get stainless rivets, they wont rust as bad.
the rivet size is measured in hole incriments , ie get a 4mm rivet for a 4mm hole, it wont wobble around as much.
they also come in different lengths, measure the amount of material to clamp together , and get a rivet a bit longer that the material.
the bit ye measure is the fat bit with the skirt on the end, not the long pin..., measure from end of fat bit to the skirt, this is yer size of rivet)
a rivet gun works by pulling the shaft back up to make like a skirt to clamp bits together, easiest way i can think of explaining it.
put yer rivet in the gun ,long pin in gun , tuther bit in the bit to fit to box , then squeeze the gun together , it will feel wierd at 1st then it just snaps back , towards ye, so be a bit carefull.
after ye got a tidy rivet and yer bit fixed
ugg . D.I.Y specialist