If you use a small smear of anti seize on each side of the wheel cylinder hole, before installing, your movement through out the life of the shoes will be much improved. They move around a lot, especially if you use your hand brake. I was looking to change them for a double piston MGB GT rear wheel cylinder, but they do a good job as is, so I didn't weld up the hole and drill out for the GT.
Always (over) thinking, Wayne