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This is the front crossbeam for the 'SG90 Sawtooth-Foot Inchworm Crawler' kit. It ties the horn-side drive arm and the idler-side swing arm to the front sawtooth foot. The plate is 40 x 80 x 6 mm with four 3.4 mm M3 clearance holes on the 30 x 20 mm foot pattern. It also has four 3.4 mm arm slots at x ±6 that run 15–33 mm out from the centre on each side, so the arm spacing can be adjusted. Each slot has a 6.5 mm wide, 3.5 mm deep counterbore underneath, which keeps the M3x16 screw heads flush against the foot.
A 5 mm thick, 98 mm long drive arm that bolts onto a hobby servo horn. A 2.4 mm radial slot running 6–22 mm from the pivot takes M2 horn screws at any horn hole spacing, and a 7 mm access hole sits over the spline screw. The far end has a pad with two M3 self-tap pilots (2.6 mm, 15 mm deep, 12 mm apart) that screw into the pad edge, so you can attach a linkage, gripper finger or flag.