Parts for mounting a torsion spring to an AX-12A s

If your quadropod or hexapod has too much payload and the knee servos overload, this set of four parts allows you to screw a torsion spring (inner diameter 15mm, spring wire diameter 2.05 mm) to the servo, horn, and F2 bracket. You will need new (longer) M2 screws for mounting, as well as an M3-10mm screw for the cap that secures the torsion coil to the horn. You need one set of four parts per joint you want to modify -- four for a quadropod; six for a hexapod. Note that the white/black flexible plastics are not as strong as machined or injection molded parts, so machining these parts out of aluminum would generate stronger parts. At considerable extra cost!