I recently purchased  Baggie feeders .  They work very well and best of all no
robbing, no jars, and no drowned bees.  A baggie feeder is a super approximately
2  deep placed on the hive under the inner cover.  1 gallon baggies are filled
with 3 qts syrup and then placed directly over the cluster.  2 two inch slits
are then made in the baggiesand a small amount is squeezed out onto the cluster
so that they know it is there.  A strong colony will empty them  in short order.
 I haven t tried it but I think an empty  5 3/4 super would work just as well.
 
Frank Humphrey