One of the D tuners on my 1919 Gibson A2 was getting stiff, so I disassembled, cleaned, and lubricated them, following the instructions on Paul Hostetter's site (http://www.lutherie.net/tuner.maintenance.html).
The only part that was difficult was getting the string posts and gears apart. It worked like a charm, and now the tuners are working better than they ever have.
If the tuners on your vintage mandolin are giving you trouble, don't replace them until you've tried this.
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