I have tried a few methods to open angle past 90 degrees. The 4lb hammer method was very tedious for some of the longer pieces so I used the bench vise and WD-40 to squeeze the angle open. This would have worked much better with a chunk of steel or something to squeeze against, but I could have wasted a bunch of time finding a suitable chunk. Instead I stacked a bunch of pieces of scrap aluminum together–this was a pain, but now I’m done :-) On the plus side, it was very easy to control the angle of the squeeze over the entire length of angle.
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