EE WAS PULLING A D RING OVER A TIMBERHEAD ON A BARGE. HE SAID HE LOST HIS FOOTING & CAUGHT HIS FINGER BETWEEN DRING & TIMBERHEAD. CAUSE OF INJURY WAS AWARENESS COMPLIANCE WITH RULES/REGS NOT A FACTOR PERSONNEL SAFETY EQUIP COULD BE A FACTOR PROFIENCY A FACTOR, MINING SYSTEM COULD BE A FACTOR