My WC cage with SmallHD 702 monitor never felt solid enough and the handles always came loose in the director's hands, so I recently came up with designs for parts that fix this issue.
The first batch of 16 kits were CNC'd and sold over at RedUser forum (thread ink). The feedback has been great. It was also confirmed that this fix works with the cheaper ProAim cage. And my fix won't affect the depth of the rig or get in the way of any wireless receivers.
I'm starting a new batch this week at $175 per kit inc. shipping. Please get in touch if you want to get one (email@example.com).