I am going to change my pool & spa light today with new Pentair 5g lights and throwing old ones away(they are no good). just wanted to know any tricks or tips to make it easier. the conduit is 1" plastic with extra ground wire that will I will leave in place. i bought metal fish tape already, but i was wondering can i use something more thin like poly or heavy duty string? i was concern with restriction going through the bends. OR can i cut the cord at the old light and fish the new light through with old cord so i fish it only once instead of twice?