3 Bearing oil tube nut removal

[Bob Kneale]

I came across a BSA combination O/E spanner  in a car boot sale (remember them pre-pandemic?). This is shown in the attached image top left. The largest size fits the oil union nut while the pipe fits though the next size down. Their short length makes it easy to fit into the open crankcase. They're not to difficult to find either,-I've seen several over the years when looking through dirty old tools.
Good luck - I haven't had to resort to cold chisel abuse for years as a result .
Bob