I just grabbed the pics off google, but I imagine It would be similar to the Neway seat cutter except on the inverse. Have a bit of a light touch or it will get jammed in a certain spot if it cuts too deep & its a bit tricky to cut through the sticky spot until its smooth again. The vise clamp jig I once had, they sent an old valve with it out of a 350 or something & it was really easy to use "like a pencil sharpener" Mine was different then the picture shown & had a hardened cutter like a large piece of square key stock that went in a corresponding square hole so it could be adjusted it diagonally in or out & locked with a thumb screw. But it wouldn't reach a small valve, the cutter wasn't long enough or the hole close enough for the smaller diameter. Just wanted to point out if it wasn't obvious to you already, All the other ring end cutter tools don't have a channel milled in them to accept a valve stem, but they are around 3 times cheaper. Mine works well, I screw it to my workbench to use but you have to use firm pressure with your thumb to keep the valve secure while cutting & this can get repetitive & tiering but beats sticking the valve in the block & using folded up fine sandpaper or a needle file between the tappet & stem to adjust, this method is excruciating...
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