How's
THIS?
Get a length and practise it a few times mate. Good luck with your job.
You may need a rubbing block or some smooth sand-paper to really tidy the cuts up if you've used a hack-saw with big teeth. A find tooth hacksaw would be better, one of those smaller ones.
Do it on a block not your leg! (that's personal advice from a guy wtih lots of holes in his work jeans).