I am having a similar problem with my grandson. He isn't strong enough to hold my Excalibur crossbow steady enough to shoot accurately. I took a good look at it and grabbed my Primos Trigger Stick. it has a "V" and a rubber strap. I set the back end of the foot stirrup in the V and wrapped the rubber strap over the top of the stirrup. There is just enough space between the forearm and the stirrup bracket for the strap to slide under. I tried it and it works great. Now I can get him practicing. My only concern now will be if a deer comes in that he doesn't bang the foot of the trigger stick on the tree stand and spook the deer.