20 Ga Clamp

Had a client ask me to design this for him. He didnt want to purchase any that were online. To hold the 20 Ga down to crimp it, you can use one of these:https://www.homedepot.com/p/BESSEY-4-in-Capacity-Square-Jawed-Ratcheting-Hand-Clamp-with-3-in-Throat-Depth-XCRG4/302468886or https://www.amazon.com/uxcell-Toggle-Holding-Capacity-BRH-301-AM/dp/B07MZRGS57/ref=sr_1_5?sr=8-5 This design is for rolling the shell of a 20 Ga shotgun shell. Can make other sizes if needed.