Cowling and spinner interference

[kmach]

shimming the motor mount with washers is common.
I did an engine swap last year took over 100 picture of things like that.
I have been maintaining/ improving this KF for 6 years , so pretty used to where things are ,but, still do not remove anything without taking detailed pictures.

I have a 3 blade IVOPROP medium IFA with a fiberglass 9 or maybe 11" (for the IFA motor to fit) UHS spinner. The spinner backplate mounts the most forward or on the front. I used 2 Fender washer under each bolt head to help with backplate crush. I have had the prop off a few times. It does not loose its torque. I check the bolt torque at the recommended 10 HRS.
After the initial torque checks when you install , I have never had the prop bolts out of torque. 400 hrs with this setup.

Another key is to mark the prop blades with hub position , so the knurls go back in the same spot.