GreenTouch Trimmer Rack Thumb Lever

So I was about to install the new rack and noticed that the rack doesn't have any Thumb Levers or even a place they could mount. Just thinking about how it would work without the Thumb levers to release the equipment. So that would mean that you would have to turn the locking handle at the very top while you remove the trimmer. Is this something new? Just seems like a pain to have to constantly hold the locking handle when you mount or dismount. The one I received says version 3 Xtreme Pro Series.

I spoke with Jordan at GreenTouch and they do not offer the thumb levers anymore on the new versions of their trimmer rack. He was very helpful and is sending the previous version with the thumb levers, so you don't have to constantly hold the handle at the top to remove or replace the trimmers.