I'm not really sure what you're asking....but I'll try to answer what I think your question is.
If you have the shoes mounted in place, but can't get the drum back on over the shoes, you will need to 'back off' the adjustment on the shoes, so that the overall diameter of the circle formed by both shoes is smaller. There will be an adjuster, kind of like a cam, with notches, that adjusts the shoes outward as they wear. Find this cam, and release it a few notches, and the shoes will move 'inward', to form a smaller diameter circle. With a smaller circle, the drum will slip on more easily. When you re-install everything, be careful when you first use the brakes, because they won't be adjusted outward.
