If you are afraid of taking it appart don't be.
Watch parts 1-9 of the instructional video here: https://video.google.ca/videosearch?q=tom+kaye+automag
and you should be ok.
If everything is working fine until it started leaking though, try the oil trick first.
"Now is no time to be making new enemies" - Voltaire (When asked on his deathbed by a priest to renounce the devil and turn to God.)