Hi, I bravely decided to replace the washers and O ring myself after the tap leaking for ages at the bit that swivels. I removed the grub screw at the back but then had to get a friend to pull the curved part out as it was stuck. I replaced the two washers and the o ring but I now can't get the top of the tap back in the hole. This should be so simple! Any advice would be gratefully received.