I've just recently bought a fake TowerPro SG-5010 and when i received it i went straight to opening it up to see what's inside:
http://s1313.photobucket.com/user/VERYlowbudgetRC/media/DSC01619_zps7deb2dcc.jpg.html
Then i went on testing it and for the price it works wonders, centers nicely, has decent speed and torque, and much to my surprise it is made by a real company. www.rc-kpower.com
I am very satisfied with this servo, at first it was a bit squeeky but now it's getting more broken-in.