I have been looking at a secondhand AstroTrac TH3010 fluid head. I have noticed that when the azimuth locking bolt is unlocked, the whole upper part of the TH3010 lifts off the base. Is this normal? It gave me a little fright because I wondered how safe it would be. I also noticed when locking the bolt again the upper unit 'pulls down' as the tension is increased. If you have a target framed, this will affect its position. I used to have a Mini Giro head, which even when unlocked in azimuth, the unit did not separate.
Any help or advice would be appreciated!
AstroTrac TH3010 fluid head ...
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