Tuning the Lorenzo Organ

I was given this organ years ago by a friend (Paddy Bloomer) who found it after someone had thrown it away. It's in reasonable condition but only has three of the four legs it had when it was made. The 'string', 'flute' and 'vibrato' switches crackle, and it has been out of tune since I got it. Until this evening. Now it's droning along with the rest of the crew.