I don't know what it's called but what it does is to drop the decompressor when you're handstarting it, so that you don't need to take a hand off the starting handle. The spiral thread means that it only happens once the engine has had a good few turns and is hopefully ready to fire. The spring would be attached to a bracket to make it work, but it's taken off for electric starting.
Bollington to Buxworth basin - a long long day
10 hours ago
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