Well I bit the bullet and ordered the OS .15 CV-A, along with some APC 9x4 props (as suggested in the Mini 3D video). That part of my package arrived yesterday but I have a slight problem. The prop holes are bigger than the engine shaft! This is a new one on me. Have any of you folks had this problem, and if so, how did you solve it? For the moment the only thing I can think of is to find some spinner spacers that might fill the gap, but is there something readily available, or a regular technique for this that I might not know about?