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Lazy Susan Pole V-Jaw Split Collar
Half of a two-piece shelf stop collar that clamps around the steel centre pole of a corner-cabinet lazy Susan so the round shelf stops sliding down and dragging on the base or catching the door. Print two identical halves and bolt them face to face with two M5 bolts and nuts; the opposed 90-degree V jaws grip any pole from 24 to 32 mm, covering both the 1 in (25.4 mm) and 1-1/4 in (31.75 mm) poles common in 1980s to 2000s kitchens, and the collar installs without removing the pole. Each half is 64 x 22 x 16 mm with a captured M5 hex-nut pocket on one ear and a 9 mm socket-head counterbore on the other, so the pair needs no tools beyond one hex key: use M5 x 40 bolts for a 1 in pole or M5 x 50 for 1-1/4 in. Sit the collar under the shelf hub with the 16 mm flat face up.
Arm Clamp Pen Collar
This collar is part of the 'NEMA17 Hanging Wall Polargraph Drawbot' kit. It is a 34 mm OD x 10 mm knurled ring, and its 22.4 mm bore slides over the gondola hub's 22 mm pen sleeve to hold the two line arms in place. One M3 heat-set insert goes in a 4.0 mm radial bore in a flat 14 mm pad. An M3x16 thumbscrew in that insert passes through the sleeve slot to clamp the pen and lock the collar with one turn.
8 mm Rod Split-Clamp Endstop Trip Collar
A split collar that clamps anywhere on 8 mm smooth rod with one M3 screw and a captured nut. Its 2.4 mm trip blade breaks the beam of a slotted optical endstop, and the 6 mm arm face presses a microswitch lever. It gives you adjustable travel limits on rod-guided carriages and arm axes that have no motor shaft to put a homing flag on. The collar is 22 mm OD x 10 mm tall with an 8.3 mm bore, and the part is 62 mm long overall.