Fan Clutch alignment

Hi guys,

In preparation for putting a thicker radiator in my car, I swapped the stock fan clutch to the Hayden 2765 that's been discussed on FABO a lot. I used the included bushing when installing it, however, the engagement between the shaft at the end of the water pump and the recessed hole where the bushing sits is pretty small so I'm not sure the bushing actually engaged correctly. It may have slid back into that recessed hole while I was trying to line up and tighten the bolts. Now when I run the engine things look nice and aligned, I can't see any obvious wobble, BUT there is a small amount of play in the pulley/fan if I try to wiggle it (with the engine off).

How much play should there be / how can I make sure this thing isn't wobbling enough to shred itself apart in my engine bay eventually?