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PVA, didn’t think of Bondcrete. Extent of my drawing education was at high school. The compass set in the picture is my original from high school, it’s going onto 42 years of age, still in good condition for a Czechoslovakia made set.
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I have a set made in Czechoslovakia and it's amazing quality.
Though I recently did something stupid with my Rotring compass from my several hundred dollar drawing set (including pens) and I can't get the tiny part anywhere. It's an old set 25 years or so but in new condition but the compass itself is no longer available or the parts to fix it (the small thing which holds the lead or needle).
The roller you've made in the last image looks good but how much load will be on the PVC pipe?
I think it would be a possible wear point where the axle goes through the PVC but that would be load dependant.