Hi Daz,I'm guessing yours is the email I've just picked up. I'll send you an email reply shortly.The small spring can currently only be replaced by disassembling the Aqua-dapter. We haven't had many break, which is the other reason why we haven't listed them on the website.When it has broken we've asked for the Aqua-dapter to be returned. With any repairs we try to get it through the workshop and back to you in as short a time as possible.Paul