K&F CONCEPT 9.8" Magic Arm Clamp Kit with 1/4" & 3/8" Thread Screw 360° Ball Heads Articulating Magic Arm Camera Mount for Monitor, Flash, LED Light, Microphone, Camera Cage, Action Camera

Don’t waste your money on the thing. Get a 1x30 Vevor that will run from 200 rpm to 5000 rpm and will be built like a brick shit house and you will have a machine that will last forever. As for an angle guide on it there are tons of ways but I used a https://a.co/d/0avMhhl7 and put a flat piece of metal on it so I can adjust it write up to the ceramic glass platen. Use a mini angle finder and you can set any angle you wish. You can get the belt grinder shipped for about $150 on sale.