I bought one from RTBB a few months ago.
You will have to drill a small hole through it for the roll pin which holds it to the metal shaft on the motor.
This is not Greg's fault but a manufacturing fault. If you buy the one from marco specialities you will have the same problem.
I am not knocking RTBB or Marco's, I am only letting you know so you don't need to make enquires about the missing hole
Greg when through every one he had in stock and they were all the same.
when I contacted marco's the said the same thing
save your self the postage and buy it from Greg
