You might want to try the Cardas banana to spade adaptor.
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I have a similar Classe amp and I simply replaced the bolt down post with new standard binding post.It's easy to do on these because if youv'e looked inside the output wiring is connected to the post via ring connector so no soldering is required,just slip the ring over the shaft of the new post and tighten.Cardas,Edison price,Vampire,WBT ect. all make excellent post that will fit right in the existing mounting hole.Check out
the sonic improvement also as those bolts are just graded steel and not very good conductors.You can also put the old ones back at any time to retain originality.