I use two kinds of sanding mops a lot, but I would not consider either a detail sander. I have two rotary tools, a Craftsman (very old) and a Dremel. I can do detailed work with these, but I find them clunky and lacking in power. My go to is my old Grizzly G9928 - Flex Shaft Grinder. It can use anything that will work in a Dremel and has plenty of power and a foot pedal speed control. If it ever dies, I'll probably spring for a Foredom tool.