Concerning the spinner/cowl spacing with various spinners. First with virtually all ARF's the included plastic spinners are most frequently simply the 'low bid at the time'. Iincluded spinners will often even not be the same from container load to container load so consistancey cannot be counted on and it at times it is even impossible to order an exact spinner from any given ARF and this even effect sometimes the big name ARFs. So here is a simple bit of info that will help you in the furture: Most of the Great Planes spinners tend to be designed with flush back plate and the spinner will go no further aft that the back edge of the propeller, Most of the Dubro spinners are designed with a recessed backplate and the spinner will protrude to the rear further than the others and this of course affects cowl/spinner spacing. So a little attention to the type spinner or brand you order can also solve the problem. John