First let me point out I am not a machinist at all. I just have a lathe and a mill and the drive to make things. More than once at times.

The biggest challenge for me was to mount the 4.5mm aluminum rough disk to true. I think I mounted it to a 1" solid aluminum machined "face plate" I made to hold disks.

I used the original back plate to get an idea of where the spinner groove should be cut. I mounted the original onto the face plate and to get the approximate location for the groove.

It took two tried to get the groove to where I liked the fit. Snug, with no play, but not tight.

Once you cut you alum back plate, you will need to secure your original plastic spinner to the aluminum. I used a center bolt in the spinner along with 2 of the original mounting hole with allen/cap screws to keep the spinner from slipping when spinning at high RPM and hitting the blades. I would have used four screws but 2 of the hole were broken.

The center extension shaft is a piece of 1/2" aluminum tapped to my engine and tapped for my center mounting bolt, originally a cap screw to simulate a cannon.

Very important to use thread lock on the spinner screws because you do not want to over tighten and place extra load on the spinner.

And as always, never be in the hazard zone of high speed moving parts. Anybody.

Steve