There are two screws at the bottom inside the feed spool chamber that secure the bracket that holds the bottom end of the roller in place. Need a long skinny screwdriver most likely. Loosen then snug lightly, nudge the roller around, tighten. And again, eye using the metal film rails, not the black strip that is the film chamber wall.
The front of the lens is threaded Series VI. No adapters needed. So a Series VI hood goes in, and captures a Series VI filter at the same time. If you want to stack more than one filter, there are Series VI adapters that have threading on the front.
Filter Find is good for these type of filters. And Blue Moon Camera. Look at the 'Series VI adapter' section of Filter Find, the lens hood called 'E' is the standard that works well. Tim has a few of them. Then in the Series VI filter section he has... you guessed it, filters!
Ask Tim if he has a lens cap that will fit the Kodak hood. The plain Series VI threading, no retaining ring or hood in place, can use a center-pinch 46mm lens cap.