Hey gearheads, this is how it started out. I made the boom to where it's extendable/retractable. Just look on CL for a used Hoyer lift, or patient lift. They come in manual like mine rated at 600lbs or battery, but only 300lbs or so. I love mine!
Forgot to say, the end where the screw mechanism is weighs a fair amount, guessing 60lbs or more, acts as a counterweight. I forgot there are otherones that are hydraulic, like an engine crane, but I don't know their counterweight. Have to take that in consideration if having a boom like mine. ; )