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I was able to get all the bolts with 4 1/2 " angle grinder from topside. Used a thick [1/4" ?] disc for all elevator bolts on the interior side of the c-chanel, grind down the ctr with the edge of the disc & tap the bolt shaft down with a punch. On the parimiter inside the c-chanel the bolts came up from the bottom. I used a thin [1/8" ?] disc. There was just enough room to slice off the side of the nut knock & it off the bolt with a punch, then drive the bolt down. Had washers under the nuts in the c-chanel so did'nt have to worry about cutting down though the chanel. Had to go slow & carefull cutting inside the chanel. If the disc catches and skips out it would slice the aluminum.
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