Posted By: Max S.I have 2 of the magnets, and they are enough to firmly hold the knife on the tape. This is very convenient to hold the blade for you when you need to re wet/dress or flit your stone. This way you don't have to find a place to set the knife down. The only real issue I have is since everything is magnetized to the machine, all of your slurry/swarf tends to cling right to the grind on your blade, makes it harder to keep your painters tape dry, also makes it easier to make buff marks on your blade. It does keep your stones a bit cleaner though. Also another funny thing is by the time your done, your knife blade has become magnetized! haha kind of funny.
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