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hitch-pin

ˈhitch-pin
  [f. hitch v. + pin.]
  In a pianoforte, The pin to which each string is attached at its fixed end, opposite to the tuning- or wrest-pin. Also attrib., as hitchpin-block.

1878 A. J. Hipkins in Grove Dict. Mus. I. 468 A hitchpin-block for the attachment of the other ends of the strings. 1881 Ibid. III. 194 The merit of Hans Ruckers..was his..boldly attaching the strings to hitchpins on the soundboard.

Oxford English Dictionary

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