All the 2030 series closer have a fixed spring sizes. Example -- a 2031 has a size 1 spring, a 2302 has a size 2 spring, 2033/2034/2035 etc. All the 2030 series closer are shipped at the weakest spring setting for the size order. There is a spring strength adjustment on the plate that can increase the spring strength about 35%, but not from closer size to another. The maximum spring turns on the power setting of a 2030 closer is 36 turns. Note: the adjustment will stop once you hit 36 turns
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