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A little off topic : From memory a single ring support at 55% or something works almost as good as an 18 point on a 2" X 20" , due to the ability to re focus out the slight overcorrection resulted from the sag on either side of the ring ( which reduces the error by a factor of 4 ) . My 14" X 1.5" is mounted like this - with a solid ring of velcro tabs on plate and mirror - no clips or slings - works a treat for many years
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