Originally Posted by MarkSumpter
Put it on a flat surface and dress it with medium grit paper... No need to seal clutch cover...
Or file it carefully if you have a large file. It's not important to have a perfect seal on the clutch cover. There's nothing in there to leak out.
I've contemplated cutting fancy patterned vent slots in mine, sorta like they do with some of the Ducati's that have a dry clutch.