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The picture also shows two different springs: one is an original brass spring, and the other is a stainless one from McMaster-Carr, which can be trimmed to length as required.
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Paula
@Paula - what is the McMaster-Carr part # you used for the spring? That seems like the one you got is good fit... there are only 1-zillion of them to choose from on McMaster-Carr. I got a stainless spring kit coming from Amazon but I am not convinced there will be one that will fit around the #6 screw, go up into the Stack's sleeve, and apply proper amount of pressur