Hey Dan, I had a simple pump hand pump first installed in my well at 200 feet. I have the 5 gpm but had the 3 gpm at first. Long story. They work great as a hand pump, but their electric motor addition is pretty well junk and very limited in application.
They can be installed along side an electric pump as back up and are installed after the electric pump is in the hole first. The only trouble you have is that some well drillers install torque arresters on the electric pumps piping to keep it from banging around in the hole when the pump kicks on. You cannot slide the new pipe for the hand pump past the torque arrestor. You would have to pull out the electric pump, remove the torque arrestor and reinstall.
I have pulled my simple pump out and never intend to use it again, I'm all
solar pumping now. It takes a lot of work to pump water out of the ground by hand lol!
If your close to sw Missouri, I would
sell my simple pump for 1200 dollars, I paid 2500 for it.
It's got the well cap, pump and 200 feet of pipe.