One must make a fixture to hold the rubber bushing mounts in alignment.
It consist of a 1.5 inch square 1/8 th wall square tube with holes for the 1/2
inch bolts. The bolt holes are 21.5 inches apart. Drill on a drill press so
the holes are vertical.

The captions on the photos explain  some other points.

It is best to set it up in the corner of a room so you can get some horizontal
measurement for the center of the prop flange. Sort of a 3 dimensional square.

The bottom line is; the prop flange must come out in the center of the cowling hole.
It is very time consuming to modify or make a new cowl.

This mount allows you to adjust for that.

BTW use AN bolts. These hard ware store bolts are just for initial set up.

Paul Lamar

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