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Jansen 123.8 mm Lower Link
Lower link k for the 'NEMA17 Twin-Motor Strandbeest Walker' kit (print ×4). It joins crank pin M to foot vertex K. The two 4.5 mm M4 pivot bores are exactly 123.8 mm apart, centre to centre, and each sits in a 16 mm OD × 6 mm hub. The flat-bottomed 14 × 5.5 mm bar is 139.8 mm long overall, with a 1 × 6 mm lightening groove along the top and a 3 mm hole at mid-length that marks it as the long link. It runs on an M4x35 (M, K') or M4x30 (K) socket head pin, with washers and a nylock nut.
Jansen 30 mm Stepper Crank
A 30 mm-throw drive crank for the 'NEMA17 Twin-Motor Strandbeest Walker' kit (print ×2). It is an 8 mm thick lever about 50 mm long. The 14 mm boss slides onto a NEMA17's 5 mm shaft (5.2 mm bore) and is locked by an M3 heat-set insert (4.0 mm bore) and an M3x6 set screw. The crank pin at M is a 4.5 mm bore with a 7.6 mm counterbore for the M4x35 socket head that carries the leg links.