Yes, you are correct, my bad. As soon as I posted that I thought I might have used the wrong term. It is the flexible couple however. Now the question is perhaps is it supposed to be one piece or two. When I found my problem and took the stepper motor off the Y axis I found the coupling in two pieces. I was puzzled how it coupled in both directions when it really only fitted together and drove in one direction. I just did some research and see that my coupling is indeed broken.
OK, my machine is a Chinese 6040Z, which dimensions should I be looking for to buy a replacement coupling?
Would this be the correct flexible coupling?
https://www.ebay.com/p/Id6-35mm-D19l...2951289&chn=ps
Thank you for making me rethink my so called "fix"!
Now to find the right size and fix it for sure.
Regards