design on my own Tiltalls: Left: Early model Leitz Tiltall tripod. (best-working; all brass, similar to Marchioni); Middle: Late model Leitz Tiltall monopod. (better-working; brass and plastic); Right: Star-D Tiltall tripod. (cheaply designed; soft nylon. Aluminum locking collar threaded onto an aluminum tube - a metallurgical no-no. Note that the nylon bushing has formed a small ridge as a result of repeated jams).
