Great planes groove tube A ‘must have’ builders tool, the Groove Tube creates clean, consistent grooves in balsa for installing aileron torque rods and elevator joiners. It’s easy to use – the hollow end catches balsa shavings when pushed along the wood surface, which is then pushed out after each pass with the spring loaded plunger on the other end. The result is uniformly round grooves – much faster, safer and more precise than using a hobby knife.
