I am going to try a Gator mount in mine. Some of my friends had succes with it using YS Four strokes and it doesn't require a nose ring. Available from Gator, Radio South, Central Hobbies, etc.
Piedmontmodels.com has a homemade one that looks compelling in the tech section on their website. On NSRCA.ORG there are some good pictures on Hanson's Roto mount in the Tech section.

Anthony