On Thu, 15 Dec 2016 11:13:05 GMT, Harry Bloomfield
wrote:


Anyone know for sure the process please?

There is no clamp. The chair is fitted from the top. To remove it
run the chair up to the top under power. When it stops fit the manual
winding thing provided (or better a socket and ratchet handle) and
wind it off the top of the stairs. There may be a mechanical end stop
or trim you have to remove at the top before it will come off.