Just purchased a Hobbico Avistar and an OS 46LA. The engine mounting procedure concerns me a little. You're suppose to put the engine on the mount, and then secure it with the 2 mounting brackets/straps that go over the engine flange. The mounting brackets then get bolted to the mount. The engine is basically clamped in. With the supplied mount, the engine appears to have lots of side-to-side play prior to securing with the brackets/straps. Is there a better way, or is this normal mounting procedures that will adequately secure the engine. I'm afraid it will wiggle loose. The mount came pre-installed. I have not yet mounted the engine. Not that far along yet. Also, the Avistar box lists recommended engines, and the OS 46LA is one of them. It also advises a 10x6 prop for this engine but OS recommends a 11x6 or 11x7. Which one should I use.