Thanks @dekay ! This suggestion works!
For the little that it is worth, a point of clarification. I looked further into the circa 1990 Monster Cable banana "binding post" type plugs that I have which accept terminated speaker cable and are themselves terminated with a banana plug to insert in the back a speaker's female banana binding post. I have 2 types. The small and compact one that I initially described which turns out to be a pair and has a female input at the end which accepts a banana plug and unscrews in the middle to accept a spade. As I first noted I now only have one pair so I cannot use them. Then I have several pairs of a larger one which was designed to accept a spade like the one DeKay referred me to and are more robust and will easily accept 2 spades. Thanks DeKay for giving me the idea!
@slaw thank you for the suggestion of the Townshend Super Tweeter but I will either use Sopraninos or the very reasonably priced TakeT Batpro MkII which a friend referred me to and which have the benefit of being a dipole. I am yet to listen to the TakeT.
My thanks to all for taking the time and trouble to help.