Simple connector for single conductor 0.75mm² (18 AWG) that will remain connected under tension while being spooled

I have a 750m 0.75mm² wire on a spool that needs a quick disconnect connector of some sort on it so it can take it off in 250m lengths. But it has to handle the tension of being spooled up. Any ideas?

In an ideal world it would be a male and female banana plug thing, but that wouldn't hold under tension. So I'm hoping you folks have ideas.