XT600 foot peg attachment
 

Hi ajax,

When you get your engine out and look at how the peg nuts are/were attached you will see why an insert will not work. There are pressed plates with nuts welded inside before these are welded to the frame.

It is a safety-critical attachment and stressed area. You do not want a foot-peg to go on you. You mention a spare frame, how does that look?

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Put nutsert in. Was not so easy to get one. needed to order and mostly bags of 10 or more.
For the peg i got a 10mm 1.5 50mm long. The hole that receives the nutsert on the bike is 13mm. The hole needs to open slightly to accept the nutsert.

Seems solid enough.

Now make sure that top one is in good shape with full threads so it can basically hold everything on its own, then the insert will add strength and be safe. Just keep an eye out for movement with use. The fix, though not ideal should be good.