Hi Paul99
Here is a link to where I got a repair kit from.
http://www.vintageeuroparts.com/100399.htmlIt took three weeks to arrive, so might be worth paying a little extra for a better shipping service.
I just did mine last month.
Be really careful with the three tab washer, mine broke, and I was extremely lucky to get a replacement from another member.
If you just need new carbon brushes, I have some, as mine did not need replacing.
Good luck