Keith, I had a diffuser made for my enlarger by a local glass shop out 
of thick frosted glass.  They didn't want to chamfer the cut edges, but 
they 'softened' them with no complaint.  Looked sort of like they had 
been belt-sanded, with no sharp edges.  Safe to handle.  Might not be 
accurate for the 'zero' gauges, though.

Just an idea,
Len

I explored a couple of lower cost glass options that had sharp edges and/or
quicky belt sanded corners.  It would be possible to make and "economy"
glass gage and save even a few more bucks.   At this point though, you
really are getting what you paid for.



	
		
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