REPLACING crankshaft seals in a Stihl MS660 -but wait there's an air leak 😲 😮 😲 🤔😔😡😠🤬

I am unsure what to say, this saw sent me into a chainsaw teardown fever. So i have torn down the 064, the 038, the 026 and the 562xp, plus discovered my 362xp cylinder didn't have just transfer, it had scoring...I'll be damned if I just don't have the worst luck ever!!!