I have an OS18TM, that after I replace the back plate and starter shaft will be running again. Since it lost so much life from an airleak around the starter shaft, I am going to rebuild it this spring. I am wondering how to mod it for more power just to try it out type of thing. I tried using the search engine, and found everything else. Seeing as I will be rebuilding it this spring, I'm not as worried about shortened piston/sleeve life at this point that would happen from modding it. Any help here would be greatly appreciated. Thanks.