My first version used a plastic tent peg as a platform. The sling shot was held in place by a bolt and nut going into the handle from the bottom. This ultimately proved to be a weak point as the plastic handle of the sling shot broke over time from the stress at that point.
So when I bought new fishing line, I also bought another 8 inch corner brace.
I cut a 3 inch section off the "vertical" with a Dremel tool and a cutting wheel. I then attached the sling shot and the fishing reel to the corner brace using hose clamps. I may take off the hose clamps from the sling shot handle and replace them with tie wraps - not sure. When I grip the sling shot handle tight in my right hand, the clamps tend to bite into my palm a little bit. To secure it well would require a bunch of tie wraps, but it would make it more comfortable to use.
I've been practicing in the park and I've been getting my 1 ounce fishing weight to get over branches 50 - 60 feet high with no problems. I have discovered one thing, though. My fishing weights (not the one in the photos) are painted bright yellow. I think I am going to re-paint them with a very bright orange paint. The yellow ones are a bit hard to notice when they fall onto the grass amid a bunch of dandelions!
72 de Larry W2LJ
QRP - When you care to send the very least!