I bought 1/2" to 1" diam circular saws that fit in my dremel tool. I got them at a Great American Train Show which always has a great selection of hobby tools. I think they are quite dangerous and I make sure I have a good grip on my tool and safety glasses with a close fit and side shields. They take an old CA hinge out in no time. Then I decide whether to use that old slot or make a new on with my Hobbico ca slot maker. Good Luck!!!!!!!