I have a couple questions for you guys, 1st, I bought a used Lynx 3-D , but it came with no switch or rx battery. Will any switch work or do I need to get a Hitec switch and can you give me a part #? 2nd, I purchased a 5925 and a 5945 servo, now ive been told digital servos are power hungry, do I need a special rx battery and do you have a part #?3rd, ( I know I said a couple but this just came to mind) it also came with a extra set of crystals and I read somewhere you need the entire module to change crystals,1 is ch 72;75.630 and the other is ch75; 75.69, an explanation of these numbers would be helpful. Thanks in advance for any enlightenment !