cangus wrote:An inexpensive enough tool and a good solution. Slow going if you have many to do.

I also have stock cans on my MC21 that need disassembly and then of course reassembly. I'm sure the packing is a nasty mess inside. They are not well suited for disassembly. Have you to sort that one out. Though i'm pretty sure this tool will be used in reassembly.

http://www.rivetnuttool.com/

Sorry to be a know-all, it looks to me like you've used those riv-nuts as normal rivets?
I apologise if I'm teaching my Grandmother to suck eggs but you do know they're meant to be a re-useable fitting? Meaning they're installed on one part of the two pieces, then a bolt can be screwed in to hold the two pieces together.