This is a 3D resin printed replacement for the Hornby Schools class, It is not separately listed on the Hornby service sheet, but is the small gear on the side of Hornby part number X9940, shown as item 6 on the service sheet. You will need to reuse both the main gear from X9940 and the shaft. Please do not order if you don't have the necessary skills to fit this item. Please see our other listings. A level of mechanical competence is required to fit the gears. If you are unsure of the method of fitting, securing, and re-setting the wheel back to back distance, then please speak to us and we can offer a gear fitting and loco testing service.
