This thread makes me miss my red tailed boa. Sold him junior year in college (when he was just shy of 9').

If you cut off its tail would it grow another? If so, then just cut it off -- gecko liposuction
Remember too, when your gecko is running away from you to avoid the urge to grab it by its tail. If for some reason your Leo does lose its tail don't panic. It will bleed for a bit then stop. Keep the gecko warm, feed it well and keep the tank clean to avoid infection. The tail will eventually grow back, starting as a pinkish stump and continuing to full grown and then regaining some of the coloration. It will never look quite as good as the original but it will work just as well at storing fat.