RE: parkzone j-3 cub 1st flight
Ahh... the PZ Cubbie. i taught myself on one too, you'll have alot of fun with it.
The spinner is a good idea espeicially while your learning becuse it will somewhat dampen the blow to the prop shaft and gearbox if you nose in...
a little dab of household silicone will retain it and also allow you to still remove it easily to change props, ect..