Replacement Gear Set for MKS HV6100 HV6110

I have recently purchased a large amount of product from Hyperflight over many orders each package has arrived in quick time and correct, the replacement gear sets are great, I still haven't found on youtube how to replace the first gear closest to electric motor.

tenéis el mejor y mas completo servicio de pos-venta, que unido a la gran calidad de vuestros productos satisfacen completamente mis expectativas.
muchas gracias