If those barrels unscrew and reveal set screws holding the wire down I'd remove those ends and put these on instead. I've used these on several custome built cables that are budget friendly. These have a friendly angle for amp side as well as speaker terminals. The downward angle is convenient on several speakers I have, do not put a high shear force on connections, locking and stackable and they're completely protected against accidental twist contact that could cause a short.
https://www.parts-express.com/angled-locking-stacking-banana-plug-with-dual-set-screws-poly-shell-an...
https://www.parts-express.com/angled-locking-stacking-banana-plug-with-dual-set-screws-poly-shell-an...