Step 2: Step 2: cutting & shaping

Picture of Step 2: cutting & shaping
When you've selected you target jug & user, take your Xacto knife (reccomended), and CAREFULLY cut out the hole where the users arm is gonna go (NOTE: I know I kinda glossed over this part, but you should DEFINETLY soften the cut edges to keep things comfy , I suggest hot glue, but I'll wager a hot hair dryer would work, too).If you have a different shape in mind for your armcannon, DON'T be nervous! Take other jugs, and cut or  otherwise splice your way to your desired design.