I wouldn't bother with the kerosene but simply fill with the appropriate oil, wriggle it about a bit and then I would be surprised if it didn't work as well as it did before. After all, if it has simply been sitting in the workshop, what could have damaged it?
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.