Abstract: On October 31, 2008 three Employee's were servicing a GK 7 and 0.0625 - inch Annular Blowout Preventer Head Tightening Sequence and the unit weighed approximately 3,000 pounds. The employees needed to lift the unit so they rigged the GK Annular Blowout Preventer with a two piece chain sling, chain support studs and a spreader bar. As lifting started, the kinetic energy from the weight of the Preventer and the angled lift of the chains suddenly caused chain support studs and tightening bar to release. Employee #2 attempted to move the tightening bar back into position by hitting it with a large hammer, when Employee #2 struck the tightening bar it slid up the chain striking the right hand of Employee #1 who was holding the chain. Employee #1 was taken to Santa Paula Community Hospital and later that day transferred to Ventura County Hospital for hand surgery to the right middle finger where the severed finger was reattached.