Constant Area Sprue Spreaders are not permitted to be modified. The regular Sprue Spreader type and the Runner-type sprue spreaders may be modified, and machining instructions are available which detail what form of machining is permitted. Pocket machining details are available for all sprue spreader types. Pocket machining details are also available for the bushings. These instructions are provided with the packaged component. If you would like an electronic copy of the instructions, please contact us.