We converted a ball return table to plastic drop pockets. We thought the metal ball return guides were responsible for nicking the balls. Not sure of that now. We put 3 or 4 tacks in each pocket to secure them. Some of the heads were protruding and the new balls are nicked again. We put black electrical tape over the heads and now I see some black spots on the red 3. Tape bad idea? What should we do to correct this problem. Not sure what type of tacks to use to secure the pockets. Thanks for any help. Black oversize Gandy.