Kelleys has been selling these types of feeders for several years.
What I do is drill a round hole in the inner cover, screen over it with #8, and sit my syrup jars over the screen. This way a quart jar will sit beneath a medium super...with the height of the feeder added in it would require a deep to cover a quart jar. Something else to consider is the indentation of insert of the mason jar lid (if using the ring-and-lid type). The indent of the lid could possibly move the holes too far away for the bees to reach. Simply install the lid backwards and the indentation will protrude outward towards the screen...O.J. Blount down at East of Eden Apiaries showed me that...and it works.
Best wishes,
Ed
