I've never used one but have read about a 'rivnut' as being useful in such a situation. https://www.rivetwise.co.uk/rivets/rivet-nuts.asp https://www.youtube.com/watch?v=FJ4gF2tXRBE
yeah... i've gone down the youtube rabbit hole in the last few hours... my concern is removing the existing bits without damaging the frame...
@superbagneres started
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I've never used one but have read about a 'rivnut' as being useful in such a situation.
https://www.rivetwise.co.uk/rivets/rivet-nuts.asp
https://www.youtube.com/watch?v=FJ4gF2tXRBE