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Joined: May 17 1999

a mate has a 510 head and something's gone wrong with the tilt, the counterbalance spring has lost it's ability to be turned off, so unless locked off, it fights the op.

He's trying to find a grip guy who can fix it, or manfrotto direct.

Worst case he'd buy a new head.
I took a quick look and in the old days. the half bowl was bolted on, so could be fitted to a new head.
Is the design different now? Do you have to buy a new bowl fitted to a new head?