One of the best investments.
snake
I replaced 5&6 in the stage box with chassis mount males for the mains. And put females on the other end. Mounted a 1/4 jack in the box for the stage monitor same on feed end. On 8 I put an RCA jack and run video to the stage monitor with a DIY xlr to RCA adapter.
One caution Never put stress on the mixer end. Once you get used to FOH mix (so much easier) you cant go back to the stage.