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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Shulchan Shlomo 313:7 - Rabbi Shlomo Zalman Aurbach Zatzal - and Shaalos U'Teshuvos Shevet HaLevi 6:32 permit adjusting the height of a Shtender on Shabbos. Minchas Yitzchok 9:38 prohibits adjusting a Shtender on Shabbos. Thanks to RabbiKaganoff.com
Rivevos Ephraim 5:264 goes through this sugya,and brings opinions some which Gershon Gold already mentioned which allows adjustment on shabbas.However he brings a shittah which holds that a yeshiva shtender which is constantly adjusted is mutar,but a shtender which is used at a specific height should not be adjusted.see inside.