I like to experiment with radio control aircraft. I tend to use Dollar Tree foam when designing them because its so cheap and easy to do. I made a servo box for a single servo but usually put the rudder and elevator servos side-by-side on the tail. I've had bad landings that damaged a servo or sometimes the servo just goes bad. I got really tired of cutting hot glued servo out of that foam. Hot glue this servo box into you Dollar Tree foam aircraft and you can remove and install servos easily, even in the field. I use a #6 wood screw to hold the servo into the box.