ORIGINAL: MTK
The nose rings I've made recently were simple 1/32'' aircraft ply glassed on both sides. I have also used rings completely made of rubber.....worked fine. In fact, for some engines with large prop drives, a rubber nose ring is a simple solution since you can stretch it over the drive washer. That's what I've had to do on the Mintor for example
Rather than using 100% rubber, I made a rubber and ply ring. I'll attach some snaps tonight if I remember. The prop drive washer on the Mintor 38 is about 30 thou larger than the crankcase diameter where the ring will do its support. So by recessing the ply about 0.1", the rubber sheet I used (motorcycle inner tube) is stretched over the drive washer and fits snug on the crankcase. Much better and simpler than making a two piece nose ring