Nice drawings Chum, going to give the swivel a go and see if I take to it, cheers.
Don't make the classic mistake of giving it 5 minutes then removing it because "it doesn't feel right". Of course it doesn't feel right, your brush now moves from side to side!!

IMO the swivel, when utilised correctly is as big a revelation than wfp itself!!

I just couldn't work with a fixed on anything below 40ft now.