Both, in sequence. The normal part: springs are rated at about 10,000 cycles, which typical use spends in 7 to 12 years, and a post-war Waltham door that has been in service for decades will legitimately be on its third or fourth pair. The message part: pairs consumed noticeably faster than that rhythm point at balance, weight change, an added insulation kit or a refinished door is heavier than the springs were sized for, or cable and roller drag making the springs work harder. The correct third visit therefore includes a balance test and a weight check, not just a swap: hang the disconnected door halfway and watch whether it drifts. A door that passes gets its springs with a clear conscience.
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