I saw that post of yours when digging around. I havent been able to find an online source for the 7129-4-F from Bergeon, but looking at cratex, I guess this in 6x3/16 and "Fine" would be the equivalent?
https://www.cratex.com/Products/Rubberized-Abrasives/Blocks-and-Sticks/Round-Sticks
Thinking about getting the Fine and Extra Fine sticks, and then try u sing the Extra Fine on the back of the case first.
Before all that... I'll try to find a pencil eraser at home.
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