I purchased this ball head just recently and have been very pleased with it but have encountered a problem. I am using a Kirk bracket made for the 5d.
To get the Kirk plate into the Z1 I had to adjust the clamp on the quick release plate slightly. Initially this worked okay but now, the QR lever locks in the 90 degree (sliding) position but does not lock into place when fully closed against the QR plate (locking position). I can therefore release the clamp to 90 degree (sliding) position without having to pull the release button.
Has anyone else come across this issue such that they can offer any advice?