Thanks for the replies, I will have a go at making one as Phil describes and see how it goes.

The guide fits the spring quite well, it's not loose at all but doesnt seem too tight. It goes on with a bit of a push so Im not sure how it could be responsible for the twang? hopefully this will sort it though. Thanks again for the help!!! and cheers TonyL for the names, if this doesnt work Ill see about getting some guides made up.