R/C Airplane Balance Tool

I wanted an R/C airplane balance tool to replace the one I'd made years ago from a piece of wood, a speaker box carpet and some bike parts.  I put a black line through the spheres to line up with the center of gravity line I mark on the underside of the wing. Line those up, level the plane and it's ready. No moving parts, no bearings, just basic. Recommend printing with at least 50% infill so that it's heavy and will stay put. I applied some sticky back felt to the underside of mine. I was teaching myself how to use the studio, it's all designed with primitives and boolean. It's PETG so it doesnt melt if it's in your range bag truck or trunk.