| Diagram | Fig. 15 — CHAINCASE AND CHAINS · ref 26 |
| Subsystem | primary |
| Listed in parts books | 1971, 1974, 1976–1978 |
Screw (7/8 in. U.H.)
A 7/8 in. screw used in the primary chaincase assembly on Triumph twins from the 1970s catalog era.
This is a 7/8 in. screw that shows up in the chaincase and chains section of the parts book, used to hold the primary chaincase hardware together. The catalog lists it across a run of years from 1970 to 1978, so it's a part that stuck around for a while without changing.
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It's a small, plain fastener rather than anything glamorous, but it's the kind of thing that's easy to lose track of when a chaincase comes apart for a chain adjustment or an inspection. Worth keeping a spare or two on hand since chaincase screws have a way of stripping or growing buggered heads over the years.
If you're matching this up against what's in your own chaincase, bring the old screw in or have it handy when you order — the parts book doesn't spell out every dimension, so it's worth confirming you've got the right one before you button the case back up.
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