That rig was still being used at Luffenham until at least the early 80s.
I know of one guy who knackered his neck prior to Linton to such an extent he lost his flying cat and had to become a ginger beer.
I had a minor neck ache after using the rig but "ignored" it. Years later when I actually did bang-out the docs were most intriqued looking at my X-rays at what appeared to be an old, albeit minor, compression fracture to one of my neck vertibrae. Could not have come from anywhere else.
Be quite neat if MB listed all the bang seat records (dates, ac, names, etc) on their web site. Or maybe that's a job for you Jim G!