Here's something I posted to the CorvAircraft list the other day that may have some relevance.
Speaking of "coming off", here's a little tale for you. I flew down to my father's farm Thursday and stopped near Birmingham to snag my brother and bring him along. While we were waiting for my father to pick us up at the runway (it's a "fur piece" from the house), he noticed that two screws were missing out of the spinner, and three were only screwed in a couple of turns, all on one side. I'd retorqued the prop last weekend (among other things), and when I put the spinner back on I'd gotten all ten screws started, but only managed to finish tightening the five on top. The five facing down got missed. So I flew it for about three hours with only half the screws tight, all on one side. Even with the five screws gone/missing, it was still tight, and showed no signs of wiggling around or trying to escape. I don't think an aluminum spinner would have held up to that treatment. I tightened the three screws, swapped one from the other side to keep it balanced (not that I'd noticed), and we flew down to my Grandfather's farm the next day, and then back home. The link to building a spinner (and front bulkhead) is located at http://home.hiwaay.net/~langford/spinner/ . It's a 10" spinner, since that's what most KR cowlings are designed around. Mark Langford n5...@hiwaay.net website www.n56ml.com