Remove worn rubber capstan by cutting it away from the aluminum drive shaft. Clean any debris from the shaft with an Exacto knife or similar sharp tool. Pull the shaft away from the velvet strip and wedge a thin spacer between it and the end of the vacuum slot. Apply instant adhesive to the entire inside surface of the new capstan. Push the new capstan onto the drive shaft. Rotate the capstan once, to spread the glue and hold it down firmly for one minute. Then allow at least 2 hours for the glue to fully set before using the machine.