When saw off part of the thread of the long bolt (screw, stud), in place of sawing produces burrs, dents. This makes it difficult to time the screws when screwing.
The matter is simplified if the threads are pre-screwed the nut, and then trim the bolt. When removing the nut itself will remove the burrs.
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PAINTING THE FRAME, WITHOUT STAINING THE GLASS
help here's a basic clamp, cut and bent from aluminium sheet 1.5 mm thick.
ONE OF REDAN
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