There are different size rivets in the casita's depending on the location. I just bought a rivet gun from home depot and it works fine.
But the size of the rivet depends on the location. I called Casita
, asked them to send me an assortment of rivets, caps, etc and it was here in a couple of days.
Then you can see the rivet you want to replace, match it with the new rivet casita sent you, use a drill bit guide to size things up, and then have fun.
I wasn't able to find the right size and diameter of rivets in the stores so I just called casita, the parts were not overpriced or anything and it was good to know I had all the proper sizes.