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Well i used this way, once
Tools
1.paper clip
2. green stuff
3. a model tool or something that looks like the picture
4. a drill that can change speeds to slow
Take the paper clip and take only the straight part, cover it in greenstuff and roll the greenstuff on a flat wet surface to make it even all over.
let it dry for 3 min or so and then put it into the mouth of the power drill, let it spin slow then take the tool and remove greenstuff by dragging the tool up, when the drill is spinning, all you need to do is cut straight up, because it is spinning, and if you go slow the groove should be uniform.
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