Very nice job!
I once [c. 1983] borrowed a wokka to lift a 35 ft. tall anemometer mast from Westmoreland [it was "surplus to requirements"] to RAF Linton-on-Ouse to replace the existing mast which was suffering from dwarfism by about 8 feet.
This quite serious matter of a short mast [hence usually under-reading] was unbeknown to SMetO present, past, and all the "Inspecting Officers" of the Met Office .............. until I turned up with weight on string and went to the top to convince dumbstruck SMetO.
I could have done the Boy Scout trig. trick, but a piece of string is VERY convincing!
Not the heaviest load for the Chinook, but among the longest I expect.
Good training, as they say.