The Speed Light Foot Adapter from Nisha is a hot shoe for portable flashes that features one PC female plug and one 3.5mm miniphone female plug. It has a hot contact on the top, a shoe mount/tripod socket in the bottom, and a thumb nut. It weighs just 0.75 oz (21.26 g).
One female PC plug
One 3.5mm female plug
Shoe mount/tripod socket in the bottom
Thumb nut