The control system is a spider and piston system which I think was only utilised on Westland aircraft. Very different to Bell, Eurocopter e.t.c.
I believe the joint in the middle was known as a Hardy Spicer but don't hold me to that, I am dredging the brain for 40 year old data.
The two lumps of metal with rods going down to the area of the spider are the pitch moment compensators.
I thought the blades were held on by a couple of gash bolts, the nutplates are missing in the photo!!!!!!!!
Going for a lie down now.
Last edited by ericferret; 11th Sep 2013 at 22:07.