Hi @JohnCalvert. I just spent some time reading through your customer service email thread. I am not the one who typically responds to custom support inquiries, but I'm glad to help you through all of your concerns.
As far as connecting the mount, the connection pins may be damaged if it is very difficult for you to connect the mount. I use my camera every day and connect the camera to the mount very easily only using one hand.
The "lock ring" of the original mount (kickstarter) design does not have a stopping point, it does continually spin. You should be able to feel when it is in the locked position at a quarter turn, another quarter turn unlocks and so on...
Regarding the audio...in our latest firmware update we've added manual audio gain control. This allows you to adjust the audio gain in 10% increments to help from the audio distorting if you are having issues with auto gain. Give that a try and see if it helps. There is not an external microphone connection. We never marketed the system to have an external connection but it is on our feature requests list.
I will follow up with your other concerns from our support email side and I hope we can resolve any problems you may have.