Employee had EE's hand on a piece of stone as EE mechanically advanced the stone forward in the splitter. EE's hand was placed in the wrong position and EE smashed it between the guide and the stone. EE fractured the tuft of EE's index finger. EE has been working light duty with no use of the upper left extremity until EE's next follow up appointment on 7/2/2019 at 4:00 pm.