We finally got around to using one of those hummingbird feeder tubes we bought. Dee painted one of our surplus wine bottles and I added the copper tubing. We originally had issues with the supplied rubber stopper leaking and eventually falling out, so we put a hole through a rubber cork we’d kept from one of the bottles and pushed the tube through that. It did a much better job of keeping things sealed up. Now we just need some hummingbirds!