Get a shooting stick and wedge it onto your lock-on. Saves on weight, easy to lash into your pack/harness, and he can stabilize the stick with his elbow, offhand, or knees. This is how my buddy taught his daughter to crossbow hunt out of a lock-on. There are DIY options for pads/claws/grips on the stick-bottom as well.I'd rather use a lock on stand but he needs a rifle rest to steady his aim. If I can find a lock on with a shooting rest that would be ideal.