I’ve never used the “swivel” part with wfp either where do you get them from?
Gardiners sell 'em. BUT you need to modify them to make them strong enough for wfp. The swivel adaptor is just like a ball-joint, one end fits your pole, the other end you brush. You need to drill a
streight hole right through the centre & insert a pin/nail. This prevents the ball poppin' out of it's socket! 5 minute job. IMO, this is as big of a revolution than a carbon pole, I couldn't work without one now. I have jobs that a fixed brush couldn't acheive.
Think of all the situations now where you can't get square-on to the window- conservatories, cars/car ports, trees/bushes, flower pots/beds, etc.etc.etc.
Combine the neck + swivel to give you the abilty to adjust your brush to any angle both up/down & side to side!!! Doing the bottom of patio doors without bending down. Getting through juliet style balconys (railings) etc. Just twist your pole & the brush swivels left/right.
Trust me Ewan, you know I'm always right.
