Your analysis sounds correct. I'm not sure whether all bleed nipples have ball bearings - these are shown in my Series 1 book, but not in my Series 2a book, and I suspect both their presence may not be uniform, particularly if you have aftermarket cylinders. Same goes for the size. One thing that is certain, is that if it looks as if it should have a ball, it needs one! The ball will be used because it provides a hard, accurate sealing surface, which would otherwise be expensive to produce on the screw - although I suspect improved manufacturing methods may make this less expensive in more recent years.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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