I love the machine!  I have had it for 30 years.  I use/d it a lot, especially when I was catering wedding cakes.  The flat beater has always been a problem.  Quite a bit of the white coating has come off, and quite frankly I don't know where it has ended up.  My cakes?
I now read the reviews of the other people that have bought new flat beaters and their problems. 
Why NOT make a stainless steel beater??? People will pay for a good product!  You have a good machine.