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Original Message
RE: One thing to try
Posted by PAR on May 23, 2017 at 17:15:09:
Charles, many thanks and, yes, cleaning the collimator lens (the accessible part) can do the trick in some cases. I considered offering this advice. However my experience is that although this action may be fine with a soiled but otherwise good and serviceable OPU, with a 14 year old unit that has been used regularly any gain will inevitably be short lived.