hi, just bought a CT5, broke the engine NX-15 properly then tuned it, after then i noticed leaks of oil coming from the pull starter. i retightened the pullstarter mechanism, but still oil leaks out. checked the O-rings, seems OK and now used some thin gasket on the mechanism but still out of luck. i cant overtighten the bolts (phillips screws) 'cause the screw head seems to give way (or i might not pull it out later) and i cant change the philip screws with hex (hex head wont fit into the hole). am i missing something here? tips will be appreciated, thanks!