My series 6 with the 912 ULS has the same angled configuration engine mount and bushings as the series 5 and I can't seem to find a good description in the build manual of how much to tighten the 4 bolts that put compression on the rubber bushing stack. I believe the mount configuration is called a "Dynaflow" or something similar, so its not a "ring" mount. Do I tighten the nuts down so that it all compresses down onto the ends of the internal steel mounting bushing or just enough to allow the cotter pins to engage the castle nut (as shown in my picture)? When I tried to tighten the castle nut down until it seemed to be stopped by the ends of the internal steel mounting bushing it was nearly beyond the reach of the cotter pin hole in the bolt. I appreciate any insight gained from experience.