In my experience with myself early in my photographic career and seeing others experiences online, most often light leaks in the final few frames of 120 film has nothing to do with the camera.
I got the jagged edges with my FX when it was new, though more on top and bottom. In my camera it is from the very rough paint they used. I actually took a very small fine file and smoothed them out.
If the light leaks happen in the same place on every roll then I have to agree it is being caused in the camera. If the bellows is leaky (there is a small bellows in there) then I don't know why it wouldn't leak light on every frame and the light leak should vary from the camera being in different light situations when using it. Sometimes the light shinning from one side brighter or the other or over all brighter or dimmer should cause a variation in the level of fog. Is it possible that someone once had a flash bracket screwed to the side of the camera then took the bracket off and left screw holes open?
Dennis
What kind of file did you use and did you apply any black paint afterwards?
Be gentle with a file or any other system you use. Best to always pull 'up,' meaning from the bottom to top in your photo. Going down risks catching a paint edge and chipping it away.
Another approach would be very fine sandpaper. Double-stick tape it to a flat (metal, wood, acrylic- stiff) and trim to a clean edge. By fine I mean 1000-1500 grit. Slow, yes, but it beats creating new grooves.
You can use tape to create a small shelf below where you are filing or sanding. Imagine a piece of tape 3 cm in width- crease it at about 1 cm and stick this edge to the wall. With the sticky surface facing up, the shelf being the sticky side of the tape. Now as dust falls, it will fall onto the shelf and stick.
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