No matter what, don't take the magazine assembly apart unless you have an octapus with a master's in mechanical engineering to help you in getting it back together.
I can't second that strongly enough. If your magazine works ok, DO NOT TOUCH IT!!!!
FLushing out with an areosol type cleaner, and then a little lube, ok, but do not take it apart, you will be sorry, promise!
Congrats for getting this old classic at a good price, and further congrats for repairing it.