If you are talking about a plastic strip that allows it to glide then I would probably try a gel super glue, but not too much so it does not get on the side that comes in contact with the desk
This reminds me of the time I was in a computer repair shop.
A guy came in with a plastic bag and empties it on the counter top.
Out fell a keyboard frame and a pile of about 100 loose keys.
"How much to repair", he asked.
"250 $ .... or you can have a new one for 5 $"
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