F5 MFG 50 round drum holder/loader for CZ Scorpion EVO 3 S1

F5 MFG produces a 50 round drum for the CZ Scorpion EVO 3 S1. Great gun, great drum. The problem is that it can be a little cumbersome to load by hand. I decided to design a holder that allows me to keep the drum stationary without needing to use one hand to hold it and turn the feeder that has a very solid spring mechanism. With this holder, you can maintain tension on the feeder dial and move it while the other hand feeds the rounds. The need to hold the drum and turn the spring is no lon