9.Solutions Grip Joint

Due to its spring loaded clamping, this cold shoe clamp enables one to one-handedly mount shoe fitted equipment very easily. Its finger screw serves both as a push knob for opening the clamp and for tightening down the clamping securely.
It fits the standard shoe sizes of 18, 20 and 22mm.
The Cold Shoe Clamp is tapped with 1/4″-20 and 3/8″-16 holes on the back side

The Manfrotto TriFlash is a unique bracket to allow photographers to attach up to three flash guns on to one light stand. The bracket also features an umbrella socket so the gun (or guns) can be used with or without a shoot through or reflective umbrella. Whether you are looking for increased overall power or a quicker recycling time with the guns on lower power, the TriFlash will be a valuable addition to your kit.

Ercole M11-050A Umbrella Swivel Adapter with brass stud.