
I bought a simple inexpensive tool just to try it. It took about 5 exercises to figure it out and get it/me working properly. The first few beats weren't broken, they were just done wrong and I had to redo them. I have to say it's a good toy for the price. I have over 200 tips that I have hand sharpened over the years. Fading my vision, advice getting worse and worse. Now all 200+ have new sharp and straight tips. It lasted about 1.5 hours at my coffee table while watching TV. Overall a good block, doesn't work well with masonry bits. Doesn't work well with double-tipped bits, but turns them into a clean single-tipped bit that requires a pilot hole due to the wider twist. I only wish the cartridge and body were metal, but this device costs 100 times more. I would recommend it for home use. /workshop and for basic drill maintenance. Use it, learn it, it cuts better after cutting more than 30 drills.

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