T300 desk clamp

Ok, so today my T300 desk clamp kinda broke. I can´t get the wheelbase attached to my desk anymore because the screw gets loose every time I try to attach it in. I don´t know where can I replace either the clamp or the screw. Maybe it´s a problem with the wheelbase.
My T300 is almost 3 years old, so I have no warrantee. Any advice on what to do?
 
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