It is crude, but effective.
This will be tricky, but you'll have to grind off as much of the mushroomed end of the bolt/screw as you can with a metal cutter/grinder disk. Lots of sparks.
Then, you'll have to get a very big screwdriver, and work the bolt/screw out using the original thread, without damaging it.
Then, you'll have to put the new bolt/screws in, and use a punch to mushroom the end of the new bolt/screw so it will not back out on you while using the soft top.
The clearances do not allow a nut to be placed on the mushroomed end to lock it in.
It does work, but you need to hold up the frame, put the head down on an anvil, then hit it with a punch and a sledge.
Good Luck.
Mike Mizesko
Columbus, OH