New HDMI clamp might be help solidate your cables.

This new HDMI Cable Clamp 1822 can provide strain relief for HDMI cable where frequent tugging could cause damage to the camera. With only one screw to mount to the cage and lock the cable, it can save space for other accessories. It mainly use with SMALLRIG Sony A6300/A6000 ILCE-6000/ILCE-6300 Sony Nex-7 Cage 1661 and SMALLRIG DSLR Rig Cage for SONY a7/ a7S/ a7R 1815 etc.

Highlight
Applicable to different HDMI cable
For use with various cage
Lock just use a 1/4 "-20 screw

Compatible With
SONY a6000, SONY a6300, SONY a7, SONY a7R, SONY a7S etc.

http://www.coollcd.com/smallrig-hdmi-cable-clamp-1822/