I am so sorry about your RealFlight Technical Support experience. Please accept my sincere apology. If there is anything I can help you with...I have extra springs I can send btw... here are the instructions for permenantly fixing the interlink:
I can give you a couple of options to fix this problem:
A. You can return this for warranty service and we will fix your controller. If you look at the gimbal and see any cracks in the plastic you will need to do this option. Be sure that your RealFlight is registered with us to receive warranty service. Then send us your InterLink controller along with a note asking us to fix your controller, please include your name address and phone number on the note. Send the note and controller to us at:

Hobby Services
3002 North Apollo Drive
Suite #1
Champaign, IL 61822


B. If you think that you can fix this, you will need a phillips screw driver, a drop of super glue, and a small slot screwdriver. You will also need alot of patience. Please follow the instructions below:
1. Remove the 4 screws on the back of your controller.
2. Locate the affected gimbal and use the slot screwdriver to pry the top edge of the center piece up and move your gimbal to the uppermost position and again using the slot screwdriver remove the bottom connection of the gimbal (where the plastic piece is attached to the trim pot).
3. Once you have removed this piece, look for the metal pin that is in the center of the assembly * usually on the piece you just removed.
4. Wipe the pin free of grease and locate the center hole on the gimbal assembly still attached to your controller. Place 1 drop of thin super glue in the center hole and insert the metal pin. Be sure that the pin is inserted all the way into the hole and let it dry.
5. Now, When you reassemble, you will need ALOT of patience! You will need to start by angling the bottom edge of the piece you removed back into the trim pot, as you do this you will need to try to line up the metal pin and the hole on the upper part of the gimbal assembly. This will take some time to line up and it can be frustrating. Take a break from it if you start to get tense! When you line the pin and hole up correctly, the top of the assembly can be slipped into place quite easily.
6. Once the gimbal assembly is in place, move the gimbal around to free up the springs as they may have gotten stuck and not feel smooth. Once you hace assured that the gimbals are moving as they are supposed to, put the back on the controller and tighten the 4 back screws.
7. Congratulations, you have fixed your controller!

If at anytime you have any questions or would like to speak to me, please feel free to call our technical support line and ask for Mary. I have talked many people through this on the phone and I would love to help you too! The number is: (217) 398-8970 option 1 then ask for Mary when you get a technician. If I am not available give your name and number to the technician and let the technician know that you are fixing your interlink controller.
I will call you back as soon as I am available.