Hmm.... could be interesting. I recently bought a second hand EQ6pro. If what you say is correct, then from what I've read, a new worm and replacement bearings on the worm shaft would go a long way to remedy the problem. I found
this site mentioning replacement worms (Gierlinger) but unfortunately it's in german so I can't translate. I think there was a mention somewhere of a translator for web pages, I'll see if I can find and post.