Shaft connector for Cyrano – 4diving

5040 Series 4 Thermoplastic Rubber Swivel Caster (Gray) - TrioPines

Spearfishing

Shaft connector for Sten/Jet – 4diving

Aopin 4mm to 7mm Rigid Couplings Set Screw Shaft Stepper Motor, Length 25mm / 1 Motor Coupler Connector Rigid with Screw for 3D Printer, RC Robot, Car Model Shaft, CNC Machine, DIY

Shaft Coupler - 1/4 to 4mm - ROB-12493 - SparkFun Electronics

UMC CX

Uxcell Rigid Coupling 25mm Length 18mm Diameter Aluminum Alloy Shaft Coupler Connector Silver | Harfington, 6mm to 6.35mm / 1Pcs

NuCanoe QuickConnect Mounting & Control Kit

Helix Operations – Rescue – Carabiners & Connectors