dont waste your money on cheap servos you really get what you pay for
get a big dog JR like a 9001 or 8711 they are like 120-140 dollar
range but they are nasty strong like 330-400 oz of torque and good
speed around .13 speed if you buy another 60 dollar servo then thats
what you will get, yes there are cheaper servo's out there that will
work just fine but if you really want duralibity and relialibity then
save up and get a big boy servo