Rear Wiper Snapped

So someone decided to snap n rob off with my rear wiper, here's what's left of it (check the picture). Any ideas on how to take this off?

Tried WD40 to get the rust off but it looks like it's stuck or glued on or something!

Any special tools or skmething?

thanks
 

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Likely need a puller.

Aluminium insert in wiper and splines on the motor shaft = TIGHT fit.

Been there. Done that.

Good luck !
 
Ive got a home made puller i did mine with that i can send you if you pay the £3 postage or whatever..........
 
Thanks mate but sorted it, didn't need to take it off, just took the spring and the main part off the new and put it onto the one on my window, saves the effort of gettin that off lol