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Message: [QUOTE="svi, post: 91076, member: 20863"] Marcus, I understand what your saying but in this one particular instance The shims do not work in the usual manner. As I understand it the main purpose of a shim stack is to seal the piston port and then yield once a set force acts upon it, the build of the stack then controls the rate of opening, the most important part of this being the initial yield point. With the compression side of a midvalve there is no initial yield point as soon as the piston travels in a compression direction the ports are open, if you didn't need the shim to seal the ports in a rebound direction you could leave the shims set against their stop away from the piston. The only reason I can see to have a stack that is set away from the piston is that there is such a significant flow that it can be controlled from a distance with the shims deflecting in a controllable range. In your original idea you suggested building up a stack against the piston, this I suspect is not done because of the large deflections involved resulting in the shims taking a permanent set. My theory with a spring was to enable geater control over the initial yield and opening of the port but still allow for the large deflections necessary. If the check plate were delta shaped this would signifcantly reduce the affect between the cartridge sidewall and the shim and the damping would be controlled by the rate of opening of the ports. Could you get the required controll from a spring ? Does this make any sense or am I disapearing up my own orifice ?:eek: [/QUOTE]

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