Got a new one of them - loop filling tap - and bish/bosh it was fitted in 2 minutes. Until I looked a bit closer... The spring clip wot slips in from the side to hold the tap in place just WON'T go in FRONT of the 'flange' (the raised rim on the tap spigot) but insists on slipping behind there on the 'O' ring side. Hence, it ain't holding the fitting in place. The one holding the filling loop pipe on to the new tap fits ok. It's the one that connects the new tap to the filter block/inlet assembly that's a complete b'st'rd, not helped by the awkward access (for big hands...) I've tried pushing the tap in as hard as possible so's the O' ring is squished, but the clip still slips in on the wrong side. HELP PLEASE!!! Hints! Advice! Ta much.