Speedo cable removal

Can anyone enlighten me as to how to remove the cable from my old speedo? I took it all apart but it appears to be all sealed up, tamper proof I guess. When I pull on the square 'cable' it feels like it has a solid end on it of some kind and really does not want to come out. What am I missing?

Sorry image didn't stick last time

It should just pull out.

Should but doesn't. I'll have to try to get it apart again

It's rusted in there from years of use. May have to remove the speedo/cable as an assembly, then turn it upside down and add penatrating oil and let it soak for a while.

Awesome. WD40 in there for an hour and a good tug got it out. Thanks RonKZ650