Mandatory Field Change
We consider this a mandatory change that must be installed before further flight.
The washer and cotter pin should be available at any hardware store. If not, contact us and we will send the components to you.
The washer inside diameter should be 5/16". The shaft is 8mm in diameter. The washer OD isn't real critical. The hole for the cotter pin is 3mm (about 1/8").
If you find that the pressed pin protrudes more than 1/16 inch out of the hub, notify the factory of the servo serial number and return the servo for service.
The photo below shows the pressed pin.