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Swing-Arm Lamp Ballast Base For 1/2 in Post
Freestanding base that turns a clamp-only swing-arm, architect or magnifier lamp into a desk-standing one: a 13 mm socket (45 mm deep) takes the lamp's 1/2 in (12.7 mm) post, and an M5 set screw with a drop-in captured hex nut stops it spinning or lifting out. The 150 mm dish is an open trough you fill with about 430 cm³ of your own scrap washers, nuts or sand for weight, and three 5.5 mm floor holes let you screw it to a bench instead.
Float Arm Clamp-On Coin Ballast Weight
A clamp-on weight for old ballcock and float-arm toilet fill valves that don't shut off fully, so the tank keeps running. It's a 64 x 34 x 30 mm block. The float rod sits in a V-channel that takes any rod from about 5 to 9 mm and is locked in place by a sideways M4 set screw. Four covered slots hold up to 16 US quarters or other coins/washers up to 25 mm across, and two zip ties in perimeter grooves keep the coins and the rod in place.
Weighted Yaw Base Tub
The foundation of the 'MG90S Animatronic Desk Lamp Robot' kit. It is a round tub, 120 mm OD x 40 mm tall, and the turntable skirt centres on a built-in thrust rim: a flat annulus from r=54 to r=60 at Z=40 with a 45° chamfered ledge underneath. Two 10 mm posts hold the slotted micro-servo plate on M3 heat-set inserts, so an MG90S or SG90 yaw servo hangs in a clear bay. A ring trough at r=41–57 holds steel washers or BBs as ballast, and a 14 x 10 mm notch lets the cable out.
Weighted Scope Probe Parking Stand
A 96 x 62 x 34 mm ballast stand that parks three oscilloscope or multimeter probes tip-down in tapered sockets that grip any 6.4–13 mm probe barrel, so a tugged lead can't drag the holder off the bench. The open rear well takes ~34 cm3 of steel nuts, shot or sand (≈130–250 g), a keyhole comb snaps 4–5.5 mm probe leads for strain relief, a 64 x 7 mm dish holds hook and spring tips, and two 3.4 mm M3 clearance holes let you bolt it to the bench.