Thank you Hugh and Vic. Guys, I have a question and I have not been able to find the answer myself. I may not be typing the correct words in on the search. On the gear reduction housing there is a box at top center, then on either side of that there are two smaller pieces. These would be the magnetos if I'm correct. One set has a round lid shape with a hinge towards the cylinders. The other version is hexogon shaped. Which one do I use with the large paddle blade prop or does it matter? And thank you in advance.