Testing out arm with nerve damage

Well this weekend I will test out my arm to see how it holds up decorating a substantial amount of cupcakes.  40 cupcakes is quite a few to be trying to squeeze a pastry bag for hours.  I do not have the arm strength of Buddy the Cake Boss that is for sure!  The hubs wanted to invent something for me that would be like a caulk gun & alot easier to use than squeezing a pastry bag....he thought if it panned out & he could sell it maybe we would have enough money to open a little bake shop.....guess what Wilton already made one you would have to refill quite a bit because its not very big.  I haven't told him yet.  He will be heart broken.  I was quite surprised when I saw it in AC Moore since I am always in the cake aisle and never saw anything like it before, it must be a new product.  Hopefully, my arm will hold out & it doesn't take my entire weekend trying to ice these cupcakes.  I see many breaks & arm rubbing in my future. :(