Adjustable wrenches Measuring tape Spirit level Use a spirit level to check the horizontal position of the base hinge. Figure 1. Base hinge on rock/concrete foundations Figure 2. Base hinge assembly 1 Base hinge (1 pc) 6 Foundation bolt threaded bar M20 500 mm (1 pc) 8 Hex nut DIN934 M20 (2 pcs). Tightening torque 250 Nm. 9 Washer DIN7989 A18 (2 pcs) 10 Hex bolt DIN931‑1 M16×160 (2 pcs) 11 Hex nut DIN934 M16 (2 pcs). Tightening torque 120 Nm. 12 Hex bolt DIN931‑1 M12×160 (2 pcs). Tightening torque 80 Nm. 20 Spherical washer DIN6319 form C (1 pc) 21 Conical seat DIN6319 form D (1 pc)