AngAk, I use my rotisserie quite a bit, my hints;
Be sure the two ends are REALLY pushed in tight, as the turkey cooks, it shrinks (it happens pretty quick). Also, tie the legs and wings close to the body. No matter how well I push in the ends and tie the floppy parts, at some point it stops spinning and bumps around until I can get it all secured again. I just place a rimmed baking sheet under it to catch the drippings.
Other than that I just let it spin till done.