Hi, i dont have CG machine too, i adjust the CG with my fingers and its just perfect, but if you want a CG machine and dont want to spend money, just build one like a friend did it! He grabs a piece of wood, he glues 2 pencils up side down (rubber up) he sharpes the rubber, and... thats perfect

And i can guarantee that is as perfect as you buy in the store
Scolpit
Portugal