My first set of cheap drill was many moons ago. I was drilling through a
piece of steel when the bit broke through and jammed. I did the usual
freeing bit and finished drilling the hole OK. Came to put the drill away
and it looked sort of funny. It was still straight but had twisted in the
middle 1/3rd of the flutes. I had a drill whose flutes started right hand,
converted to left hand and then went back to right hand. The edge was still
sharp and it still cut OK. Looked really weird though.

John