I use an Arborist sling-shot. I've had it for almost 10 years. Have 60-70 foot oak trees on the property. Use a tennis ball full of old metal washers. Punched 2 holes in the ball and made a wire loop. Have a cheap deep-sea fishing reel on a platform that sits on the ground. The ball flies right over the tree easily. -- Bw_dw at fastmail.net