Chinrest arm lens holder
Description
this is a lens holder to attach to a chin-rest aiming to alleviate the burden of traditional trial frames for observers in visual psychophysics experiments for lens diameter of 38mm - adjust the inner diameters of the two bottom circles (Body33(1), Body33(2), Body33(3), Body33(4)) to the size of your chin-rest before print, the current diameters are 16.8mm and 13mm respectively - need to buy 6 pairs of M5 hex head bolts and nuts from your local store to assemble this model
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