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/
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MC21R9N track
MC18R2J track
CBR954
CR250