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The most obvious benefit is improved control, particularly when working on stainless steel or aluminium. Dropping the machine speed can prevent accidental damage to the workpiece from the grinding / finishing process.  The second key benefit from reducing the belt speed comes from the cooler operation.  Cooler grinding leads to a longer abrasive belt life.  We have seen customers who get as much as 6X the belt life as a result of reducing the operational speed with no loss in grinding capacity.

Very quickly.  With a bit of experience, you can change the belts in less than 30 seconds! The belts release very easily with no loss in belt tracking.  Slip the cover guard back on and away you go.

Tracking the machine is very simple.  After putting a new arm on the machine, fit a belt and then adjust the angle of the arm to be centrally aligned. Then, lock the arm loosely.  Finally, use the tracking screw and adjust the belt until it runs true.  As a final check, a simple pulse on / off with the power will show if the belt is tracking well.  Now you can lock the screw tight and carry on sanding.

It depends.  Inter-changeability adds flexibility to your belt file.  If you only want to do one process, just buy one arm, or a machine with a fixed arm.  Working in a more general metal fabrication industry, you may find that you need a few different arms.