I have the Manfrotto 577 adapter mount and plate. I would like to mount it on a slider ball head. Please advise me which ball head should I choose(handy size and below 70$ is prefer)?. I have other ball head but it useless since it uses hexa screw to mount the ball head to the adapter (hexa screw has the thread slighly smaller than the 1/4" female thread on the 577).
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