| 摘要 |
Spaced headstock shafts are supported in common headstock walls such that their ends are inaccessible. The shafts are connected by an active timing belt. A spare timing belt is assembled around, but held out of contact with the shafts. At replacement time, the worn active belt is cut and removed and the spare belt is axially moved into its place. The drive may also include a belt tensioner.
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