Ok, now I'm a little shirty.
I was rather unimpressed to attached the handle to the mount, give it a little shake and have it pull right off the mount, screw sockets and all (pic 3). Mind you, I'm not entirely sure what this handle is for, I certainly wouldn't lift the mount with it!
Now I've got the mount assembled. I went to attach the trunnions (pic 1) to the OTA, but I'm not sure what to do. The fittings on the side of the OTA (pic 2) have bolts in them, going into hex lock nuts. But they're so tight, I can't budge them!!