bird feeder problem (1 Viewer)

I have a very nice square feeder whose roof lifts up for filling on a central cord. The problem is that this central cord is nylon, goes through the roof and ties to a central point on the bottom of the interior. Rain follows this cord causing spoilage of the seed. This would make a fine fair weather feeder, but it rains frequently in the winter where I live. Any ideas on how I can stop this problem?

Maybe tie the cord to a hook attached to the roof, and seal off the roof opening with roofing sealant or caulk?

Get a rubber cork and cut a slit half way through so that it squeezes its self to the cord to act as a gasket.