I recently serviced a Kimball vertical, model 4236, serial B43898, which belongs to a piano teacher. She complained about sluggish keys and upon closer examination, I discovered that several of the butt springs (Pratt & Read action) had broken off. My question is twofold: 1. What would cause the butt springs to break off? There were a LOT of springs broken off, and not necessarily all grouped together, but spread throughout. 2. Will the Schaff stock springs work as replacements, and if so, which strength (medium/heavy) is recommended? Someone recommended using heavy in the bass and medium in the rest. Thanks, Todd L. Mapes Associate Member
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