So I searched the internet for solutions. Seriously expensive locking plates are available from
Touratech https://touratech-usa.com/store/Tour...Zumo-396-LMT-S $175USD
Zumolock https://www.zumolock.com/index.php/n...ock-3x0-detail 79 Euros

The Zumolock video led me to believe that all it does is prevent the plunger to release to the GPS from moving. Sounds easy enough to achieve. I went through a few zip ties to find that they will can be used to stop the plunger from depressing. I rummaged around and found a reusable item to achieve the same goal.

20190605_131835.jpg

The orange piece is a Niteize Gear Tie https://www.niteize.com/product/Gear...opables-12.asp
Wish me luck.