Thank you Gents, Sounds like I just need to man up and give it a go. Appreciate the various pointers and hints. In regards to why I'm replacing it - the plastic tube collar that attaches the lid to the main lower body has cracked, hence the spring is not retained, subsequently the lower part is presently only held on by the wires and fuel line. End result being a super unreliable fuel gauge. Having recovered from checking out the price of a new unit via CC, I found a used one for £30 on eBay. I'll let you know how I get on. Many thanks Chris