The gate is carved so that it fits within a quarter of an inch of the walls. It was well-balanced, reportedly so that a child could open it with the push of a finger. The mystery of the gate's perfectly balanced axis and the ease with which it revolved lasted for decades until it stopped working in 1986. In order to remove it, six men and a 50-short-ton (45 t) crane were used. Once the gate was removed, the engineers discovered how Leedskalnin had centered and balanced it. He had drilled a hole from top to bottom and inserted a metal shaft. The rock rested on an old truck bearing. It was the rusting out of this bearing that resulted in the gate's failure to revolve. Complete with new bearings and shaft, it was set back into place on July 23, 1986. It failed in 2005 and was again repaired; however, it does not rotate with the same ease it once did.