Procedure:ATTENTION tripod in lateral (=horizontal) position!!! Move C-arch back and forth 10x over full stroke; In between p.238 stepwise tightening p.1661: with tightening torque 10 ± 1Nm. (Fill in Acceptance Record) Move C-arch 3 times back and forth.P.238 relax by unscrewing p.1661P.238 retighten by tightening p.1661: with tightening torque 3 +1-0.6Nm. Move arch 3x and tighten again p.1661 with 3 +1-0.6Nm. (Fill in Acceptance Record)p.1609 (2x) SECURE: with tightening torque 9 ± 1Nm. (Fill in Acceptance Record) Apply lock varnish p80 to p.1661