I totally agree about the useless metal sleeves! I bought some around twenty years ago, tried them a couple of times, and remember thinking, why do the suppliers sell these, they simply don't work! They look horrible, and mysteriously when the pin goes back in, it's as loose as before! Sandpaper or veneer are much better for a shim for just the odd loose pin, and in a piano of no particular value. Best, David.
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