Invicta

I think this might be the right site for some specific help. I create 1:6 scale military vehicles, figures and weapons as a hobby. I have just started a WWI Stokes Mortar. Next stage is to make a couple of simple mechanisms that will make it traverse slightly and also elevate slightly. I think there may be some Technics worm gears that might help me achieve this? Any advice as to what to use will b very much appreciated, Bern