Thank you, I will inspect it on the bench at the weekend and look at doing this. I do want to give it a go to maintain originality and just for the achievement factor.
Replacement valves here, should you need them - https://www.ebay.co.uk/itm/20436009...Y2an46CWdFKN7xpLdao/PJnA==|tkp:Bk9SR5r4xvPjYg