Tim,, I put a "disk" of 120 grit sandpaper between the spinner backplate and the spacer disk,, The Avenger has flown that way without slipping the prop since 2006,, well excepting the regionals when a line clip flipped over and I bounced the prop,, wood special carved one,, which lead to a test flight over the grass complete with handlaunch from Pat, GULP,,,
anyway,, back to the point,, The sandpaper disk , PSA backing, seemed to give it just the grip needed,,
glad to see you with a better airframe,,