I fail to see what is wrong with sending them back to the manufacturer to rebuild? At least it will come back correct and sound like the model it is supposed to be.
There is nothing wrong with sending the cartridge back to the manufacturer if you want the same cartridge back, as I stated earlier, I would like to try something different and Ortofon will not offer me that service. I want to try the Fritz Geiger S stylus profile (as this is the one I really like) with the sonic character of the silver coils. I've had two silver Meister carts now and I feel that a hybrid of the the Royal N / Silver Meister II would be my ideal SPU. I fail to see what's wrong with experimentation.