You have me on the years in industrial controls...I'm around 15 years plus a few
years during college
Control/power panels for cranes and the operator cab controllers. Mechanical stuff
was for the motors, gear boxes, brakes and sensors. Gantry, bridge and stationary
cranes and other industrial equipment and systems.
We supplied the controls and power equipment to the manufactures of these large
cranes.
The only chain experience was with the wind-generator construction and maintenance
equipment I designed.
I do not consider this shackle design appropriate for this application. Maybe acceptable
if the shackle pin was safety wired, but still use another method, and
yes, this is NOT a core strength of mine (chains)
Also assumed sized large enough for that loading, but then why did they reduce
it strength with a modification reducing it's cross section?