I like using Shur-brite abrasive hook-and-loop pads for steel surface prep. The problem is that they should not be used above 10,000 rpm and all I have is 11,000 rpm grinders. At that speed even a slight unbalance of the pad causes vibration and worse, the abrasive burns and leaves marks.
Before I do the obvious and invest in a variable speed grinder I was wondering if anyone tried to use one of the "router speed controls" to reduce a grinder speed. Like one of these:
Michael Koblic, Campbell River, BC