ebay mike
Retired, but still hoarding. (GOF)

Found it. The maker is a company called NOMO. The cleaning 'wheels' aren't a rubber type compound - they're solid like grindstones. I've not used it yet and probably never will if it's going to significantly wear my track away.I've got one of those motor units with the small cleaning wheels in the garage somewhere. It has a maker's name on it but for the life of me I can't remember what it was. Pretty sure it was German though. If I come across it I'll update this reply.

The one on fleabay in Gizzy's post sold for £113.36