I am making a toy car with nails for axles and plastic wheels. The block of wood had a thin, 1/4" groove in for setting the "axles" into for a car. (about the kerf of a blade). Unfortunately, these grooves are too large for the nails and positioned perfectly for the wheels locations.
Is there an easy compound I can use, and then re-drill to fill the holes to make use of the block again?