Cut them with a thin cutting wheel on a dremel or a grinder. Tape them first and score the tape with a razor, then cut outside the score marks. Wear a mask, its dusty. Go easy, little at a time, dont burn through it or force the tool against teh material.
Clean the fork cutting guide well, pick out the embedded metal pieces
Tape bar with masking tape centered over cut, 3-4 wraps should do
Line up cut in middle of tape, put in guide carefully, just enough to hold the bar
Use a very fine tooth hacksaw 25-35 tpi
Cut very slowly by allowing the weight of the saw to do the work, NO forcing
Slow down at the end
Sand with a fine grit to finish.
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