I gotta admit that getting out the sending unit had some challenges...but now that I have done it I don't think a 30 minute replacement time would be out of scope!! Mine did not change resistance at any float location so I had to take it out and get it working again...the reaching in and trying to move it idea would be great...Unfortunately I do have Paul Bunyan forearms since I am an avid woosplitter and axe chucker!! I have my own gym too so I haven't missed any weight time either this year...I don't close! Question though since I do have a 14 year old that isn't huge yet how do you reach in there?? Does the filler neck that pops up come out? I played with that a few days ago but couldn't see if it did pull out completely and I don't use force to get anything apart unless I know how it does so!Pulling the sending unit out is too much work. I roll up my sleeves and fondle both floats till they are loose. I dont have trucker forearms so I can fit them inside the tank.