# EC11E15244C0 appears to be a perfect match for the OEM encoder but is NOT stocked by Mouser (or anyone else as far as I can tell). Mouser does carry the 1.5mm pushbutton version, part # EC11E15244B2, which adds 1.0mm of travel to the other model. This should also work provided you provide room for the extra travel.

Stu
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If you want it to break, buy Sony!