Abstract: A tool is provided for the consistent positioning of a tube initiator agat the inside wall of a casing of an explosive device a fixed height above the bottom of the casing. The tool has a base plate with at least one hole formed therein that is sized to form an interference fit with the end(s) of the tube initiator that will reside within the device's explosive material. A spacer is attached to the plate and extends away from the plate in the same direction as the tube initiator. A handle or grip is attached to the plate and extends away from the plate in a direction opposite that of the spacer.