I have a Shtender and it has an option to remove the top part of it and use it as a table-top Shtender. Is doing this — removing the top part to use as a table top or putting it back to be used as a regular Shtender — allowed on Shabbos?Another aspect of the question is the height can be adjusted to make it a sitting or standing Shtender and is adjusted by using a screw like implement is one allowed to adjust the height (My concern is Boineh or Makeh Bpatish.)
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