Hi Lewis
HEQ5-PRO tripod head
Well Diameter = 60 mm
Well Depth = 19.5 mm
The well depth measurement was hard to read - so it may be out by half a mill. - I really need my reading glasses to hurry up and arrive from the optometrist! Move in close to read the scale - out of focus. Move away to get in focus - too small to read! No magnifying glass handy.
Anyway, hope the measurements are useful - and i managed to make this post before midday - whew.
Paul