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Author Message   Paul_ron Tinkerer Username: Paul_ron Post Number: 266 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Thursday, December 08, 2011 - 06:20 am:    If I remeber correctly there was a discussion on this once before, maybe on another site. Under the top cover, in the prism compartment there is some foam that gets gooy n has to do with why the OM meters don't work well as deteriorating the prisms themselves. You may find an articls here in the repair section along with the manual for that model.