I was looking for a heavy-duty photography gimbal head mount for use with large telephoto lenses. At the time, the commonly available gimbal heads were either too expensive or not up to the task.
I designed this gimbal head specifically to support a large 600mm f4.0 telephoto lens. I fabricated the mount out of alloy and mild steel. The main arm structure of the mount is a weldment with machined end fittings on a thin-walled 90 degree tube. Each arm fitting contains a rotation lock assemble and two heavy-duty ball bearings.