Got home yesterday, so today I went to Sears and bought a good quality handheld riveter, capable of doing 3/16" rivets and also stainless steel rivets. I drilled out the broken rivets (this was the most difficult task because they rotated with the drill bit), then installed the new rivets. Easy!
Thanks for everyone's advise. I love the IRV2 forums!
Jim and Suzi Bakker