I've had to do this too... I know MicroMatic has some nice schematics on their site in case you get all the little parts mixed up...
Altogether 1420 in the Shire was a marvelous year... The Northfarthing barley was so fine that the beer of 1420 malt was long remembered and became a byword. Indeed a generation later one might hear an old gaffer in an inn, after a good pint of well-earned ale, put down his mug with a sigh: Ah! that was a proper fourteen-twenty, that was!
- J.R.R. Tolkien, The Lord of the Rings, The Return of the King