List, I'm working on a 1930's Harrington baby grand. It has the type of wippen where the springs are held in place by a thread. About 10 of these threads are broken. No big deal to fix them, but I'm wondering what to expect in the future. How long can these threads last? Should I go ahead and replace them all, or just fix the 10 already broken and move on? Is it like the old plastic elbows, where once a few start breaking you know they're all going to break? Thanks, David Weiss
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