Yup if it was abit notchy I would leave it as it would bed in but its to the point of nearly locking, I have tried new bearings, shim front to back play inside and out and no joy. Teeth on pinion and other gear all OK and greased with Teflon grease. I found out the bearing size and ordered some arrma shims that have inside diameter of 7.1mm so should be able to shim where I need if they ever come. If that doesn't work I will just order new pinion and other gear.