The previous reviews were spot-on for the challenges. The different spacers and contact rings are tight to get on and the placement is important because when the hose goes back into the handle they need to be aligned with the contacts on the switch. The images in the instructions are a little small and dark so they don't provide a lot of detail, but once you look at it you see the setup. Take pictures as you disassemble the old handle for reference. Well worth the effort when the hose is perfectly fine.