The 5475HB servos are a excellent choice. I used these on my UCD46 and I was very pleased with them. These servos have virtually zero slop or backlash and their superior holding power and perfect centering are important with 3D throws . Do not used Locktite on the control horn screw, it will weaken the resin gear and it will fail. I have alway been a Futaba fan but these Hitec 5475HB put my favorite Futaba 9202's to shame and were $20.00 cheaper as well