THE COMMERCIAL PLT & A PSGR WERE MAKING A LOCAL FLT. THE PLT SAID HE PLANNED A TOUCH & GO LANDING ON RWY 17R WITH WINDS FROM 280 DEG AT 4 KTS. HE SAID THAT AT TOUCHDOWN, HE FELT A 'SHIMMY' FROM THE TAILWHEEL. HE WAS ABLE TO STOP THE SHIMMY BY RELAXING THE BACK PRESSURE ON THE CONTROL YOKE. HE THEN REAPPLIED THE BACK PRESSURE & LOST DIRECTIONAL CONTROL. THE PLANE DEPARTED THE RWY TO THE RIGHT & GROUND LOOPED. THE LEFT WING, STABILIZER & ELEVATOR WERE DAMAGED. NO PREIMPACT MECHANICAL PROBLEM WAS FOUND WITH THE TAILWHEEL ASSEMBLY.