I have been trying to cast a typical eating fork, but can't seem to get the aluminum to flow beyond just past the neck of the fork where the prongs are located. I have tried casting from the handle side, the prongs side, and both. I tried putting a block of wood touching the prongs when I create the mold so there is a clear path to the prongs. None of these methods have worked to get the prongs to fill with aluminum. I was thinking it could be caused by either the surface tension of the liquid aluminum being greater than the available space of the prongs or perhaps there was air pressure - hence my trying to pour from both sides of the mold. Anyone have a solution?