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I also have used PBR stick, but would like it if it had a larger diameter.
Wonder if something like this would work (320 grit version)? https://www.amazon.com/Research-FLEX-HONE-Cylinder-Silicon-Abrasive/dp/B005ANHXMU
Or maybe this? https://www.amazon.com/Carving-Burr-Silver-Coarse-Shank/dp/B0037MI6Q8/ref=pd_day0_328_6
Quoted from wayout440:This is all you need
If you can get them small enough. 
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Edmonton, AB