A good knot for fixed paternoster ledgers also used for joining two unalike lines.
Double about two feet of line to form a loop and pass the doubled end through it.
Continue passing the end through the loop four times.
Wet the knot and pull tight so that a loop of about 1 foot is created and trim the loose end.
Connect the swim feeder to the line in the same method as the loop to loop passing the loop over the feeder or leger or cut the loop off centre so that the knots do not foul each other and tie the hook to one end the feeder/ leger to the other.