I'm trying to find these screw caps that connect the wires to my old canton speakers. ( Please see attached pics ) I dont know what they are called and where I can find them.
It's probably your best chance of sourcing another.
Wouldn't be too hard to open the speaker and fit a (widely available) pair of 4mm terminal posts.
More easily, fit a large croc clip on the wire....plenty of room for the clip to go at a right angle, to the left of the post - and it would bite on nicely in that large gap in the threaded part.