I've been shooting an APA Twister for 4 years now without a single issue. If you're getting 1/8" of horizontal slop, here is what to do. Loosen the screw that holds the piece that the cord goes into. Squeeze the entire assembly, the prongs and the peice the cord goes into and retighten while you have it squeezed. Now, you may squeeze it too much and the launcher might not be able to twist freely. if that happens, carefully loosen that screw again, just a tiny bit until it is slightly free. Retighten.

I personally love this rest for hunting. It's simple and very durable. Unless someone comes out with a better mousetrap, I'm not changing rests anytime soon.