Does anyone know what thread the small '2 BA' size nuts are that retain the 2 triangular shaped gauze oil filter covers ? A 2BA socket fits the nut externally, perfectly, but the thread definitely isn't BA! I was told they're metric, 5mm is the closest fit but it isn't a standard 0.8mm pitch.
There is a lot of this size thread employed elsewhere on the Gipsy.
Gipsy Major nut/ bolt threads
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