If you have a CH Yoke then you know the weak points on that yoke are the clamps.  Mine recently stripped out and here is my fix.  I used electrical tape, black and taped a wide flat slat to the bottom bracing against the lip in the back. I left about two inches of overhang at the sides and using quick grip clamps I am able to clamp the whole assembly to my desktop and its more secure than the original clamps ever were.  Plus, the electrical tape won't ruin the plastic like duct tape might.  Give her try if your clamps are wearing out. 8)