Mineral jelly (vaseline) mixed with 3-in-1 oil was the standard of the British trade for internal lockwork and hinge-pins for ages. When Cyril Adams bought Atkin Grant & Lang in the early '80s, he said this was still true. A client, a president of Timken Bearing, strongly recommended white lithium grease, so he tried it and still uses it today. A friend who works for Purdey says that they still use the vaseline/3-in-1 mix.