Calvert recommends eliminating the rubber that sits in between the perch and the spring, I am not sure about the one that goes below the spring. What I did was get a one inch lowering block at my local parts store an custom ground them down and set my pinion angle at the same time by grinding the front thinner, by the time I was done the blocks were pretty thin but still strong and I reused the rubber bottom portion until I get some new ones that are urethane from summit.
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