Thanks all for your input I do appreciate the input!! 
So Noitoen,
I understand what your saying but given the circumstance I'm not to worried about that, as you can see the key way starts about 4.09mm back from the end of the shaft and only makes contact with ruffly 1/2 of the balancer / pulley key way causing a slight twist to the load on the key thus the divot in the key way.
If I cut the key way on the shaft to the end of the shaft the key and both key ways shaft and pulley will have 100% contact making for a much more even load on the key and should eliminate the pulleys desire to spin on the shaft or at least greatly reduce it. Thoughts any one ?
Jerry.
So Noitoen,
I understand what your saying but given the circumstance I'm not to worried about that, as you can see the key way starts about 4.09mm back from the end of the shaft and only makes contact with ruffly 1/2 of the balancer / pulley key way causing a slight twist to the load on the key thus the divot in the key way.
If I cut the key way on the shaft to the end of the shaft the key and both key ways shaft and pulley will have 100% contact making for a much more even load on the key and should eliminate the pulleys desire to spin on the shaft or at least greatly reduce it. Thoughts any one ?
Jerry.
ETC57, proud to be a member of MetalworkingFun Forum since Feb 2012.