some one was selling them pretty cheap on one the forums a couple years ago ,& I lost the info, it was plastic & had a knob to tighten it up, jut looking for a cheap easy fix for a tight s/focus adjustment , thanks in advance
Is this what you are looking for?
https://www.amazon.com/gp/product/B009SPDU3C/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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