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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 336 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Thursday, August 09, 2007 - 03:20 pm:    Hi Rick: I've never replaced the prism, but my notes from working on the meters take you to where it's obvious how it comes out. The notes that I posted on line are not very pretty but they will get you there: go to http://rick_oleson.tripod.com/index-40.html and follow the links at the bottom to the three FTN pages.