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I will throw my 2 cents in. I have used an Uncle Al press and it was easy to use. Foot pedal control that raises from bottom to top. Claibourne top to bottom. Have you talked to manufacturers about them? I thought there was a long back order. I thought I read where the Uncle Al tonnage had been increased.
Rotary platen I never figured what they were needed for except to convex.
I made a double disc grinder. 9 inch you can used standard sand paper with spray adhesive. I spray disc and slap a sheet on it. Trim to size and go. Extra pieces for hand sanding. One side I keep 60 grit on it. The other side has 1/8 inch rubber which i use 120,240, 400, up to 1000 grit.
A comment on 6by 48 inch grinder. The belt still has a splice to looks flat but not really. Grind on one and take that piece to a disc and see the ripples.
I have a Square wheel full blast, a Jerry Braggs grinder that stays on 800 RPM with a 10 inch wheel, and a built 18 inch grinder. I use them all for certain things.
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