Edge,
I've got 126 flights on my Patty and around flight 110 or so I had the same problem. I took some thin (about 1/32) dense foam tape and placed it between the removeable sections and the main sections. Then I used a nylon webbed picture framing clamp and placed it around the complete stab section to pull it together and tightened the screws. This has completed eliminated any play in the removeable section of the stab. I think this was caused by people using their legs, standing in front of the stab to hold the plane when I started it. Now, I will only allow someone to hold the plane by the wing and the fuse when it's started.