Yay I have the shutter cock lever facing the correct direction now.
My C3 came with the owner's manual. They explain how to remove and re-attach the lens. I'd be happy to scan if if you'd like.
I had a hard time getting the idler gear cover off, turns out the focus ring was stuck and all I was doing was slightly unscrewing the lens from the body. Once I got the lens off I was able to work it free again.
I cleaned the lenses and a bit of the body to spruce the camera up and it's good to go.
Thanks for your help.