After pulling the top of the tower off you'll have a retaining nut that holds the shank in place in the tower. On the back side of the shank is a beer nut, either winged or hexed, pull that nut off and the tailpiece ( the piece with the barb hooked to the hose) will come off and you can unclamp the hose and switch it out. There is no need to pull the faucet off or pull the shank out.