We have various ball and socket heads, the range varies from time to time, but here's a few (July 2020):

K+F KF31.021

Metal 360 degree ball and socket head

Kood small ball and socket head

Small ball and socket head with standard thread to fit lightweight cameras etc. Weight: 100g.

£8.90

Kood Mini ball and socket head

This excellent mini ball and socket head stands approx 53mm tall. It has a 1/4" thread on the bottom allowing the head to be attached to many applications, such as mini tripods, magic arms etc. It has a 1/4" screw which can screw directly into cameras, GoPro adapters and the like.

£6.99

Kood large ball and socket head

Larger heavy duty ball and socket head, with standard screw fit. Also has a quick release plate. Weighs 270gms.

£18.99

K+F ball and socket head for above tripod

£28.99

Lastolite hotshoe Tilthead Shoe Lock 2422

£26.99

Has a screw locking shoe mount, which offers an additional locking mechanism to work alongside the built in method used on the flashgun. The dimensions of the hotshoe on the bottom of each flashgun can vary from one model/manufacturer to the other. However, the TriFlash Shoe Lock can comfortably accommodate these variances.

The Hotshoe Tilthead Shoe Lock will fit onto any support device with a traditional spigot fitment. The tilt mechanism features a ratchet style pivot which eliminates any sudden movement when the locking screw is realesed. An umbrella socket provides the option to use a reflective or shoot through umbrella.
The dimensions of the hotshoe on the bottom of each flashgun can vary from one gun to the other. However, the Tilthead Shoe Lock can comfortably accommodate these variances, including the Nikon SB900.