On 6/27/14 the EE indicated that the injury occurred on 6/20/2014. He explained that they had been lying on their backs tightening an adjustment nut for the belt with a wrench. It was an awkward position as they had to pull on the wrench at the same time to get the nit to tighten properly. He felt a little pain in his groin but he said it did not hurt that bad.