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Okay three tenths of a thou in steel --6 tenths in aluminiun all up nine tenths less than 1 thou total still doesnt explain 5 times the clearance required and I cant imagine how you could achieve a temperature difference between eyepiece and focusser to cause a problem--if the clearance was aprox 2 thou--does anyone preheat there eyepeices? ( Just tongue in cheek).
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