Here’s a very quick hack for the Dremel battery tool.
Grab your vice. I’m using a hefty machinists vice.
Take a thin bit of steel suitable to fit between the jaws. This was off an old PC case, 1mm thick.
Make a 20mm hole to fit dremel through, then bend to match width of tool where it meets the vice, as shown.
Clamp tightly in place, and carry on. Use eye protection and ear protection too, as you’ll notice it is louder than normal without the damping from your hands.