A really interesting thing ....
Looking at Stephen's picture above of the wands attached to the tools, you may wonder where is the clip. This is the only Hoover model I am aware of where the pip and clip were at the back of the nozzle rather than the front.
It APPEARS that on Stephen's later replacement hose they have kept this arrangement as teh (now plastic) clip appears also to be on the back. I am surprised that Hoover continued this variant for a single model, but there is is.
The 417 as shown above continued until 1956 when it was replaced by the downgraded (and very short lived) 417C - think this may have had a braided hose. The whole 417 series was downgraded losing pip and clip connections, and the "aerodyne" style carpet nozzle, which was used on the new Constellation, the 417 carpet nozzle (as shown in Mike's above) was something of a throwback to that used on the 402. The floor nozzle also lost the swivel action too. The machine it self was also changed losing the runners for moulded bumps, the lovely arrangement for the blower (which reminds me of teh Lux XXX) and a simplified front end - I do not have instructions for the 417 but it appears to have had provision for paper bags, and if so would have been the first UK cannister to so do, actually I am not sure if it were not the first UK cleaner as I cannot think of an upright which did either at the time - 1953.
Al