The drum is held by a snap ring on the top or screws. The good news is when you lift
the drum off you won't have parts
flying every direction. The pawl springs are inside the larger gears. If you open them up you can loose them. Don't worry, if the winch is this old go to West Marine
and by all new springs. They stock them as well as Barriant springs. $1 per spring sort of a rip off but the trip to the store costs more than that. You may not require new pawls but you can buy them at West marine
as well. Cleaning
and grease will usually make them seem like new. The gears are all machined bronze and should still be good.
Takes about 45 minutes to clean in kero and grease everything well.