I did a trial fit of the spinner tonight, both front and back plates installed. As was previously posted, it was perhaps 1/16? short of being flush with the backplate.
The first photo shows the Hartzell diagram on using spacers and washers. I started out with the spacer and one washer between the spinner backplate and the prop hub - this yielded the previously reported 1/16? short problem. I then used just the spacer and the spinner is now flush with the backplate.
Do this fit up before you follow the Cummin video on drilling holes and such for spinner screws.
Carl
