RE: Needle lengthening for cowl
Take a 2-56 socket head screw, cut it to length where it sits just inside the cowl, file a flat on the end, insert it into the needle adjuster, and tighten the little lock screw. Then you can put the cowl on without any trouble, and use a small hex driver to adjust your needle (I use a long handled ball-tip, so you can increase the distance between your adjusting hand and the prop.)