Here is a servo mount i made for one of my model airplanes. Its a way to glue your servos but not the servos themselves.
1) Scale this 102%, if its still really tight then make it 105%.
2) Remove the bottom of your servos, its as easy as unscrewing 4 screws and taking the end off. Then put the screws back in but but not the back.
3) If you have any problems please let me know i'm more than happy to help!