When they were assembled NEW at factory, they were done like any other pump from Base UP, new threads, nuts, etc., BUT w/rust & extra paint over the years, there is just no way to start dis-assembly from top w/o a Large Hammer.
No reason for nightmares! Just load up the parts, drive 600 miles from Mass. to western Pa., and I'll coach YOU how to put it together. Then you simply load it up and return home! Sam