I've been having problems getting a good finish on my projects before starting. On aluminum, steel or stainless steel I always have some scratches ,tool marks or areas I just can't reach well. I started searching for micro sanders and came up with this one https://www.amazon.com/Proxxon-28594...s=Micro+Sander . I was about to post a question if anyone had any experience with it. While searching I came upon a guy that used a kids toothbrush as a sander on wood .
I got one for $4 at W-mart ,with battery !
I plucked out the bristles with a small side cutter and hot glued on a small piece of wood to back up the sandpaper. I tried 1200 and 2000 grit wet or dry and wasn't very impressed. The paper seemed to dull and load up very quickly. I searched around on my bench for some sort of stone and looked in my drawer of useless rotary tool attachments. I hot glued a cut off disc on the brush head and it worked GREAT ! The disc gives a broad, smooth sort of grind to the metal and removes scratches and tool/file marks well.
The head only oscillates about 2mm and fits in some tiny places. You can shape it on your diamond hone to fit where needed. Use the center part of your diamond disc that never gets used anyway. An eraser cleans the buildup of gunk. Just run it for a second or two against it.
I don't know how long this cheap little tool will last but I'll just get another when kaput. It takes about 5 minutes to convert.
Hope that helps ,it sure did me, Mark