I just bought a set of early model Edelbrock RPM's. I was wondering what kind of problem people actually had with them not having a spring cup/locator? The ones I have only have two metal pieces under the springs. I take it that those are the shims. One had been cut through by the inner spring. No damage to the seat. Has anyone ran these without needing the cup/locators machined in with no problems? The shop by me want $15 per seat just to machine them for the cups. That seems high to me.