| Buy a really decent file
Several really decent files, coarse and fine
| and save it for use on steel only, guard its | edge(s) as you would a honed wood chisel. Don't try to remove too much | metal but dont let it rub, make sure the vice is at the exact height for | your forearm to be horizontal, only work in excellent light with clean specs | if you need them, Treat each stroke as a new event I used to rotate the | workpiece so I could observe the pattern to ensure I was cutting in the | centre without rocking. Do not be in a hurry the fun is the journey not the | destination (as they say)
Thinking back years to the Apprentice School. When you get a cube side *almost* flat, I was taught to turn a fine file at right angles to the normal way, hold it with two hands one on each side of the work, and then work carefully in the bump
/\ Movement of file \/
| | | | | | | | | | hands ___________________________________________ ___________________________________________ file | | | | work
Hope this is understandable