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A 40 mm long bolt-on skid rail (print 2) for the 'N20 Twin-Track Mini Tank Chassis' kit. It holds the lower run of the 12 mm-pitch track down between the drive and idler axles, and a 10 mm wide keel rides in the links' centre band. It attaches to the Tank Hull Tub side wall with two M3x12 SHCS and M3 nuts through 3.4 mm holes at x ±12 mm. The rail has a 45° stiffening gusset, counterbored head pockets and 3 mm lead-in chamfers on the keel.
A 30 x 49 x 5 mm clamp bar from the 'N20 Twin-Track Mini Tank Chassis' kit. It lies across the tops of both 12 x 10 mm N20 gearmotors and pulls them down into the Tank Hull Tub cradle with four M3x8 SHCS (3.4 mm holes at ±11/±20 mm) screwed into the hull's heat-set posts. Two 1.5 mm locating lips straddle the 12 mm motor bodies with 0.4 mm clearance, and a 10 mm notch passes the motor wires.