Grind the mold area and create a new sprue well by enlarging the old one- This practice is only a temporary cure yielding mixed results. Though the mold is repaired,  it will eventually succumb to the same fate. It also is important to note that the mold only can be ground to within a reasonable length (usually from 2.75-3 in. of the mold edge) to ensure against leakage. If this distance has been compromised, the mold must be scrapped. In addition, if the choke is located in the sprue, it also may be burned. Grinding and enlarging will eliminate the predetermined ratio between the choke and other elements of the gating system. 

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