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I have a few of the original ones, and did grind the dimple off. I was able t buy those black "feet" that serve as a stop from Bessey (this was some years ago) and after drilling the hole needed installed them. Anyway, try some heat to soften the glue and then use a wire brush to remove it. the glue should soften somewhere around 140-150º so the bar may be hot to the touch, wear gloves and use a heat gun to soften the glue.
I started with absolutely nothing. Now, thanks to years of hard work, careful planning, and perseverance, I find I still have most of it left.
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I have found that PVA glues can sometimes be softened with Denatured Alcohol. Take a rag saturated with it and let it sit for a while, keeping the wet with the DA. Then use a piece of hardwood scrap to knock it off. I use this method with Titebond type 3. Let me know how it works for you.
Captain Kirk was talking about my shop when he said: Space the final frontier!
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Acetone works well but evaporates so fast. My Bessey clamps are really bad, I was thinking of buying pvc pipe, capping one end and filling with acetone to soak/submerge the rails (although I think acetone will soften the pvc because I believe PVC primer is acetone). Now I put wax paper over the rails when gluing but the damage is already done.
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Thanks all for your advice.
Herb
I'm supposed to respect my elders, but it's getting harder and harder for me to find one now.
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I think acetone is a bit too strong; mild acids can be effective. I would try vinegar.
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Have you thought about De-Glue Goo? I’ve not used it, but I’d try it for that purpose. I think it’s a gel form of vinegar.
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I just scrub along the sides (avoiding the tops and bottoms) with an old scraper blade.
There is a fellow on YouTube who designed an apparatus using pvc pipe.
https://youtu.be/IH39f0qhuG4
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A soft wire brush on an angle grinder makes quick work of removing glue.