are 2-56 pushrods too small for the liddle stick with a .30 size engine?

2-56 hardware is pretty standard all the way up to .60 size planes. You'll need to make properly constructed pushrods though. If you are planning to just run 2-56 wire from the servo to the horn it won't work.

I was just reading that some use 2-56 hardware on 1/4 scale Cubs. While I don't recommend that, I do use 2-56 hardware on models through .60 size.

A little more positive reinforcement Here: Absolutely not anything more would be gross overkill kind of like using using 2/56 sized hardware in an eight ounce indoor flyer

John