defender wiper problem

hi all my drivers side wiper only moves a couple of inches , think its the splined sleve that it sits on because the wiper arm and this sleve come off when i pull it off , does any body no were i can get one ,thankss

If it's as it sounds, I've just done mine and you probably need a new "wiper wheelbox" I got mine from Rimmer brothers (google them) and fitted it and now fine. I did order the original part not pattern as think the extra £10ish was worth it as a bit of a fiddly job and don't really want to have to do it again any time soon. If you look back to 12th Jan on here you will see my post on here asking for help doing mine and Busterbus posted a brilliant post with pictures and details of how he did his. Bloody good help!

Have you tried fixing the wiper arm adapter back onto the spindle as it might have just come loose, there is an Allen headed grub-screw which holds it in place?

"does any body no were i can get one"
From a parts supplier or even Ebay??????? Part number STC987.