Many of the VMAR Tail Dragger Models use a flange inserted into the bottom of the Rudder. This flange has a pipe like tube on one end. The tube has a plastic liner with a hole through it like a piece of air line tubing.

The Tail wheel assembly has a metal rod protruding from it. This rod is to go through the plastic liner of the Rudder Flange. In some cases either the rod is a bit too big in diameter or the hole in the plastic liner is a bit too small making it difficult to insert the metal rod into the plastic liner. Without inserting the rod into the plastic liner in the flange, the tail wheel will not steer when the rudder is turned.

Resolution:

Use a small drill bit and an electric drill to drill a larger hole through the
plastic liner. Or remove the plastic liner and install 1-2 layers of thin heat shrink tubing over the metal rod and then insert the shrink covered rod into the flange. It is important to maintain some form of plastic or insulating later between the metal rod and the metal flange to avoid radio noise caused by metal pieces vibrating against each other.