LEGO Technic Liftarm 1x7 (6278125)

my son lost this part while building some cool original lego technic monstertruck (thanks to the LEGO company), and i was irritated not to find it somewhere here.
luckily 2 were used in the model, so i started to reengineer it . the angel was a littlebit tricky, but works now well and is doing its job