1. I have a drawer marked “Bumpers, Feet and Grommets.” In it one would find crutch tips, various. I slipped them on the side spindles and the pipe clamp feet stayed put for downward pressure. Easy!
2. I built a little gizmo to insure the backs would all be at the same angle. It’s 3/4 ply. One to clamp to the seat, one to clamp to the back, and two angle pieces to guarantee consistency and rigidity.
-- "...in his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"