Had a horrible experience with the 21C4140 belt. It slipped, squealed. Junk in my opinion. I put the factory belt back on and perfect. No squealing, pulls hard, over all just way smoother. Gates belt wouldn’t move machine until 1900 rpms, factory belt moves machine at about 15 to 1600 rpms. Now i want a spare. Whats up with this 23c4140 belt being 1mm wider. Will that help?