Banana posts for Classe

My tri-wire speaker harness is terminated with WBT banana plugs to facilitate using a speaker selector box, which I use during summer only for outdoor speakers. During winter, I plug directly into my amp. I recently purchased a Classe DR25, which has large brass screws for speaker output posts. These are very nice for spades, but do not accomodate bananas. Does anyone know whether Classe makes a threaded screw insert with a female banana termination for that series of amps, or are there any aftermarket makers for something like that. I believe the thread is 1/4-20, but I did not check for sure. The hole the screw goes into is just slightly too large for the WBT's to fit snugly, even though they have the expanding plug end. Unfortunately, my rotel speaker selector box will not accomodate spades or I would simply reterminate my wires. As always, thanks for the help. - Tim