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According to Halacha is it permitted for Jews to attach or detach detachable cup handles on Shabbat or no? Would it fall into any prohibited melacha or something else?

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  • You mean because we may come to use the cupholder in our car or the cd drive?
    – shmosel
    Mar 29 at 23:26

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It appears permitted in your case since the cup holder is only loosely connected to the cup. See Rambam MT Shabbat 22:26

A candelabrum made up of separate pieces may not be reassembled on the Sabbath, nor may a chair or a table made up of pieces be reconstructed, for this resembles building. If, however, one does reassemble these objects, one is not liable, since [the forbidden labors] of building and demolishing do not apply regarding utensils. If [the parts of such a utensil] remain loosely put together, one may [complete] its assembly.

Shulchan Aruch (OC 313:6) writes the same if the cup holder is not tightly assembled (which seems the case in your example)

It is permitted to assemble and separate on Shabbos parts of a cup made of different pieces. However, there is an opinion that says that a cup has the same rule as the bed. Rema: If usually tightened, it is forbidden to reassemble even loosely.

See also Magen Avraham which permits attaching covers to cups.

This is likely to depend on the specifics of the product so, as always, consult your rabbi before implementing anything you learn here.

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