For my sins, I purchased an old Arca ballhead from the evil place. It was advertised as coming with a Kirk QR clamp, and certainly it comes with some kind of clamp. There's no marking on it so I can't tell if it is Kirk. The problem is in my ignorance, I didn't check that the width was right for my monorail, and it isn't - it is too wide. So... how do I get the QR plate off the head? I've tried putting the base in a vice, locking the ball, and twisting it off - I didn't try very hard for fear of breaking something, but it certainly didn't come off easily despite spray lube. There are no obvious screws to undo or other adjustment. It's probably been in place for 20+ years, so it won't be easy in any event. But any clues would be appreciated. Should I for instance be hitting it with a rubber hammer?
Many thanks
David.
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