From Daniel Wong- Attached is a photo showing three (3) different versions of the leg lock
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).

How long before the Star-D nylon bushing needs a replacement or tweaking. With hard use are we looking at years or many years?
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Hard question. Since most Star-Ds are already 20+ years old, guess would be many more years.
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