If you are talking about slitting the tube, nothing beats "sawing" them on a mill. The problem with sawing them with a saw, is that a blade width does not always leave enough of a gap, so you need to cut twice. But there are ways to reduce the cuts to so short that it does'nt matter much anyway.
The best way to shorten the slitting process, lighten the assembly, and make things look blingy, is to cut in twice on a straight line with a 1.50"-1.75" hole saw. Then carefully cut out everything between the holes with a mill or hack saw. Finsh the edge by filing or grinding, and you can have a large, smooth, perfect oval. This can be done before the slitting operation. That way there are only two short cuts to make.
Cutting the top end of the tube at an angle offers additional shortening of the slitting distance, lightening the assembly, and making things look blingy.
Time and work can be saved by putting the pinch system in place before slitting the tube, then slit through those and the tube at the same time. This way you make half as many pieces, alignment is already done, and there is less distortion to the tube. (Recommend re-drilling and facing afterward as pinching will tilt the pieces some, also check bore for high spots).
With this you can make mounts that work and look as good as anyone's with very little equipment. I'll try to get a picture of some made this way.
