I grabbed a K5-A on craigslist this week and decided i was going to re-grease the gears since it was around 30 years old. When I got it, it had orange blotches all over it which I think was the grease and a funny smell when you turned it on. I opened it up and there was alot of grease that was unused but what was on the gears was dried and hard.
Then I put it back together with no extra parts left.
The smell was still there when I turned it on but I found out what that was when smoke came from the back the power cords were on the power supply, getting smoking hot on the jacket and causing the smell. I am letting it cool for a bit but I think all is well with my newest toy. My wife wants it to get painted metallic purple, so I'll keep you posted.