well I went an looked an found a ( walkman blue lettered WM-10 on the door that you open ) silver one - but it works - though slowly still....

I have a few in red that dont work as well, maybe just looking for a cover change ?

here's a old picture of what I just dug through again

http://i56.tinypic.com/2d1o8xf.jpg

 or think of just some modeler's paint an a tiny brush or youjust gotta have a blue one...