I agree. Will's figures are what was original to the movement, but they were grossly over powered so that they would run longer. Willie's recommendation is what most of us use to replace them.
The spring charts I have indicate the original spring size as 0.017" x 3/4" x 96". I agree, 0.0165" x 3/4" x 108" is good. There is plenty of room in this movement for the extra length.
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