Chuck,
Actually I looked at those and decided they would not work, they are slightly to large to re-thread for screwing on to the ZW posts, for this reason I found the Radio Shack stackable Single Gold Banana plugs that separate, and re-threaded them. You simply unscrew the spike mid section & re-thread the hole to fit the ZW posts. The problem now is the RS cost for these Stackable Gold Banana Plugs, & $10.00 a set that's $60.00 to upgrade the old ZW transformers. Chuck if you can find a place that supplies RS with these Banana plugs, please let me know, I definitely want to drop the upgrade cost.
PCRR/Dave