These DELRIN compressions washers 3.17mm Ø ID - are used as compression washers to hold the correct compression in a CarbonBird motor such as the 775kv, 888kv, 1175kv series. They are normally long life and re-usable if removed carefully. When the compression is set correctly the motor will run silently and freely because these Delrin Washers act as cushions to the micro-bearings and race.
Includes 5*washers - see photo
Note - normally used individually so 5 would be used on 5 motors - but can be used in multiples to "pack" and allow a softer cushion in the trust axis - some pro-pilots believe adding 2 washers allows for a reduction in friction and more efficiency whilst keep vibration in the motor to a minimum.
When removing a shaft - first heat and remove the grub screw - then tap the shaft to loosen tension - this will allow you remove the circlip easily without damaging the old Delrin Washer. When assembling a motor - install the Delrin Washer and the Circlip whilst the shaft still has axial free-play - then finally - tap the shaft own and apply the grub screw with fresh loctite. Be sure to use good tools with grub screws.