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Author Message   Shacksmac Tinkerer Username: Shacksmac Post Number: 3 Registered: 10-2009 Rating: N/A Votes: 0 Posted on Tuesday, March 30, 2010 - 11:42 am:    David's ground glass recipe is great - in the UK carborundum powder is the thing to use - if it is still available. One further point; it is much easier to get the accurate focus on a ground glass screen if the ground surface is NOT TOO FINE. Focus seems to snap in and out better.