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This is a case of the nuts rust bonding to the bolts. As the nuts are welded in they're there to stay.

I've been successful drilling a re-tapping using a good varriable speed drill and lots of sharp carbide and tungston bits. I start by grinding the area flat and using a center punch to mark the center of the bolt material so the drill doesn't wander. Then I drill with a 1/16" pilot hole, and progressively use a 1/8", 5/64", etc., untill I can slowly re-tap the new hole. Then I use LOTS and LOTS of anti-sieze compound on the bolt as it's inserted. Between that and the oil I throw in the frame each year, the new inserted bolts slide out slicker 'n snot.

 
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