I am working on a small project that will need to check for proper UPC's then if validated, lift a barrier gate to move along cardboard boxes. The Arduino comes in with the gate lifting. I have this barrier gate working with a very small servo that came included with the Arduino Starter Kit, but this could not hold the weight that might be pushing up against it with a longer arm. Has anyone had any experience with something like this or could someone direct of a power supply/servo combo that would be up to the task? These boxes could weigh up to 20 pounds.