Step 5 of 6

Rotate the plastic support several times while you gently push the rubber wheel with two fingers from both sides.

After the rubber wheel sits proper on the plastic support, clean the surface of the new rubber wheel with a soft stuff (cloth) - or a cotton swab - that has been plunged into denatured alcohol.

Careful inspect the surface of the pulley and - if necessary - clean it with a cotton swab.