Now for the update. I went ahead and removed the movable face, disassembled it, and if I wasn't mistaken, looks like SOMEONE ran the scooter with the belt off (wasn't me). Anyhow, I put the rollers back in and greased as needed, and reassembled the movable face carefully: I even waited until it was completely on the crankshaft before inserting the boss collar. With everything tightened back up, and the drive belt ON FIRST, I cranked her up, and found ZERO noise from the crankshaft area as seen in my video. So the crankshaft seems OK. All that is left is a compression test, which I don't think will be an issue at this point (I received the 12mm compression test adapter a few days ago). Already in the process of reassembling the body, but I have one favor to ask of anyone who has a CH150: Can you please send me a photo showing how the drive belt air cleaner is supposed to be installed? When I got the scooter, it didn't have one. I bought an OEM replacement, but can't for the life of me figure out how it is installed. Thanks.