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How can I smooth the trackball plexiglass hole? (ouch! it's sharp)
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Mameotron:
Sorry, looks like I saw your post too late.  Oh, well, here is what I did...

Use a deburring tool on the sharp edge.  Start with just a light pressure, it will take the sharp edge right off.  Press harder and you can chamfer the edge.
They sell for about $3.

http://www.grizzly.com/products/item.cfm?itemnumber=G5618
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