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That is when you go along the length of the blade, if you do it across like you would use a buffer , then you do not have wavy scratches. Still the best tool to use would be a buffer, no question...

I made a guide, its 1x4x 1/2" aluminum block with #52 holes in it, works great.

Pushing the pedal to produce constant speed can be very uncomfortable. the Wesheer has a knob that sets the speed.

Those are two different tools , so the speed ranges are true.
As far as heat, if you have a jig it will take care of the heat dissipation away from the blade.
In my experience when sanding the...

I got this one, its OK.
It has speeds much slower than any Dremel, but as I got more experience I use dremel 99% of the time. I use that tool for drilling pin holes in the scales now. The more...