Hi to BB and Dean H, Good thoughts there BB, that might well be the case, I have not seen the cutter shaft worn like that personally; but it would explain the symptoms, to a tee.
The next question would be...What would cause the shaft to wear like that in the first place?
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl