Image: Vampire BAR spade
I suggest that you make use of the Supra BFA connectors (bananas) you have and simply slide the tip into a Vampire BAR spade termination entry hole (not the BAR8 spade with a larger termination entry hole). Simply push the tip of a Supra BFA contact into the termination entry hole of a Vampire BAR spade and bingo, it's ready to go (similar method as Xhadow's banana-to-spade design).
For a more robust/permanent termination, the Supra BFA's tubular contact can be cut very close to the connector base, a filler material placed inside the tube, and a crimping tool used to very securely crimp the Vampire BAR spade onto the Supra BFA contact. The modded connector can still be removed from the Supra's modular design.
