I have a 1111 series Stihl. No nameplate on top cover. No manual Oiler, no chain break. No provision for hand guard. Top fill oil tank. 52 mm cylinder. 050 fan cover. I’m reasonably sure it’s an 050 with pin drive oil worm drive washer. Can this be converted to an 075 by adding studs, new cyl and piston, and drilling case and mount a manual Oiler? One more thing, will the 050 fan blow enough air over the larger cylinder and still run cool? Would an 075 fan and fuel tank mount to this old 050