On November 17, 2000, at 1551 hours Pacific standard time, a Cessna 140, N2154V, veered off the runway and bent a wing tip and a main gear strut during landing at Sacramento Executive Airport, Sacramento, California. The airplane, operated by Carter Flygare, Inc., and rented by the pilot under the provisions of 14 CFR Part 91, sustained substantial damage. The private pilot was not injured. The local personal flight departed Sacramento Executive about 1445. Visual meteorological conditions prevailed and no flight plan was filed. The pilot stated he flew to nearby Franklin Airport to practice landings. He made several full stop landings and several touch-and-go landings. He returned to Sacramento Executive for a full stop landing. During the rollout, the tail wheel began to vibrate. The shaking was at a slow rate initially, and then became progressively worse. He stated that he attempted to ease off on the elevator pressure, but lost directional control in the process and the airplane swerved to the right. The airplane ground looped and departed the runway.