Veggie, Nice score!
You don't need to file the bars, you can open them slightly...There is a tool made specifically for this but I have used a socket ( all of my Craftsmen's have a slight bevel on either end). Find one that is just a little larger than the clamp ring, push it in and move up a size if the dia. is still too small.
Works every time..Good luck.
Best, Ben
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Last edited by xiaoman1; 07-01-19 at 08:27 PM.