Got the new window sliding jaw. The $7 plastic piece that glide the window up and down. 50% of people say to drill through the new jaw AND the old rivet and the other 50 % say to take the regulator out and PEEN the new rivet on. Which one is better. Both sound difficult.

Also what about putting in a bolt in if you drill. Is it tough to keep the nuts tight so it does not come loose.

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'89 420 SEL
'90 300 SEL
'84 300 SD (sold it)