The cutoff wheel is one of my favorite tools for use on a Dremel. But, the little discs do not last long when cutting on a piece of sheet metal and frequently need to be changed. That means I need to have a screwdriver at hand to remove the small screw that holds the disc in place, and to tighten the new disc onto the mandrel. This Instructable will show a simple modification that should be standard on every Dremel. The only thing needed to make this modification is a grinding stone. One attached to a Dremel will do the job.
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Step 1: Screwdriver Options
I usually use a very small screwdriver, but I also discovered the middle screwdriver bit on my Leatherman PST will also do the job in a case of necessity.
Step 2: The Other Tool for a Dremel
Everyone who has a Dremel knows the little wrench that comes with the Dremel. Why does this little wrench not have a spot on it that doubles as a screwdriver bit to remove and to tighten the little screw on the mandrel? One tool could serve two functions.
Step 3: Do a Little Grinding
Almost any grinding wheel will do the job. Here you see a common grinding stone in a Dremel. Even an oilstone and some hand labor would do the job. I chose to grind on the side of the wrench because it already has a straight edge, but the round end of the wrench could be made flat and straight, too. I ground at a very shallow angle until the edge of the wrench was thin enough to fit the slot in the mandrel screw.
Step 4: And, It Works!
In the photo you can see the new, thinner edge of the wrench mated with the slot in the mandrel screw.
My Dremel came with a plastic case that holds the various bits and the Dremel wrench. That case is always in a drawer at my workbench. I can put my hands on the wrench very quickly anytime I need it. But, the small screwdriver I usually use to change the cutting discs seems to wander around the top of my workbench and even hide under other things. This will save me time I would spend looking for my small screwdriver.