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An L-bracket (34 x 27 x 18 mm) that carries the Ø10 mm snap ball stud under the 150 mm tray. It is part of the 'SG90 3-DOF Ball-Balancing Platform' kit (print ×3). The 5 mm flange has two 3.4 x 7 mm slots, 24 mm apart, for M3x10 SHCS going into the tray's M3 heat-set bosses. The ball centre is 16 mm from the mating face, so the Snap-Socket Linkage Rod clips straight on.
A flat link, 87 x 17 x 8 mm, with two snap sockets 70 mm apart (centre to centre). Print ×3 for the 'SG90 3-DOF Ball-Balancing Platform' kit. Each Ø17 mm ring has a Ø8.6 mm bore with a Ø10.4 mm double-cone band in the middle and a 1.5 mm split slot, so it clips over the Ø10 mm ball studs on the SG90 Ball-Stud Crank Arm and the Tray Ball-Stud Knuckle without screws. PETG is recommended so the rings flex without cracking.
A 36 x 16 x 5 mm servo crank with a built-in Ø10 mm snap ball stud 20 mm from the shaft, printed ×3 for the 'SG90 3-DOF Ball-Balancing Platform' kit. It sits on top of the stock SG90 single-arm horn. The horn screw goes through the Ø7 mm hub bore, and two M2 screws go through the 2.4 mm slot (5–15 mm from the shaft) into the horn's own holes. The Snap-Socket Linkage Rod then clips onto the ball.