All, About these Gin poles: - Antena Mart (Max Gain Systems) http://www.mgs4u.com/ginpole.htm - IIX Equipment http://www.w9iix.com - Rohn And this device: - Tower Block http://www.superiormusic.com/towerjack_towerblock.htm Question: Is there a ball bearing inside the pulley of the head of these ginpoles and the pulley of Tower Block? TIA de Roger - PY1OL