Bear,
You can get them off without damaging the finish as long as the finish is sound. Get a fingernail or stiff piece of plastic under the edge of the base and lift steadily until it starts to peel loose. Usually the adhesive will stay on the limbsaver. Adhesive that remains can be rubbed hard and it will roll up and come off. To re-use them, call limbsaver and ask for some replacement adhesive disks. Usually they just give them to you. Roll the old adhesive off and clean the base with acetone. Apply the new disks, and you're back in business. I've done a few of these :D
David