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Hello Duncan,
the weights on the shift mechanism are responsible to get the shift lever back to center and help to get gears in.
The springs jeakeru mentioned are springs that press detends in, so the gears don't pop out. Maybe there is something wrong with a detend or a spring for your 5th gear.
You can check the cables. But in general this wouldn't affect only one gear.
Regards, Markus
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