We bought tefillin for our son, however the back/inner side of the shel yad have many spots where the leather is very abrasive. Through wearing it the last 7 months most are smooth, but some still remain. I don't want it to be an unpleasant experience (דרכיה דרכי נועם). Is there any problem with burnishing (halachic or practical). e.g. this attachment with a rotary dremel together with this gum tragacanth

  • Consult your local Orthodox rabbi, or better yet, your sofer Nov 1, 2020 at 20:06
  • 1
    Shouldn't be a problem. There seem to be 3 types of straps, some have very rough backs, some where that roughness has been somewhat smoothed and some very smooth, all seem to have gone through a different degree of processing in the factory / workshop.
    – The GRAPKE
    Nov 1, 2020 at 23:59
  • 1
    in my experience, tefillin take a long time to "break in". 7 months isn't very long. give it some more time
    – ezra
    Nov 2, 2020 at 0:09


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