[Avodah] Can You Change the Height of Your Shtender On Shabbos?

[Prof. Levine]

 From http://revach.net/article.php?id=2392

The Shulchan Aruch (OC 313:6) discusses the circumstances under which 
putting together beds and utensils that come apart, would be assur on 
Shabbos because of Mileches Boneh, building.  The Mishna Brura (45) 
says that these rules do not apply to the "cover and lids" of 
utensils, which may be freely opened or shut on Shabbos without any 
problem.   The reason is because the cover of a utensil is meant to 
be opened and shut.  Therefore closing it cannot be considered building.

Based on this Mishna Brura, the Pischei Tshuvos (3) says that Rav 
Binyomin Zilber permits adjusting the height of an adjustable 
Shtender on Shabbos even if it means loosening the screw and 
retightening it, because the shtender is moved up and down all the 
time.  Rav Vosner in Shevet HaLevi (6:32) says that there is no 
question in this case because the adjustable legs do not come off the 
Shtender, they always remain together in one piece, and the shtender 
is always usable regardless of the height.

He also brings the Minchas Yitzchok (9:38) who is machmir and says 
that since the shtender is sometimes left in the same position for a 
number of days, it is not like utensil covers that are made to 
constantly open and close.
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