I have tried reinstalling the bolt carrier spring-loaded post, but it is impossible. The post looks 2 times longer then the one pictured in Ian's book. Turns out is a Mk2-style post, but I don't think it would work on a Mk1 carrier. Am I correct?
It would make life much easier for everyone, if you could post some pictures of the problem that you have encountered here in order to give them a better understanding of what you are talking about, please.