The pilot stated he was conducting a personal flight and flew around the local area before returning to his departure airport. He entered a left downwind for runway 25 and completed his before landing checks. The winds were reported to be out of the west at 16 knots gusting to 26 knots. He lowered flaps, extended the speed brakes, and turned on final approach. The landing flare was initiated over the runway and he reached over to retract the speed brakes, and inadvertently retracted the flaps. The glider collided with the runway hard and came to a stop. The pilot exited the glider with out assistance and with out injury. Examination of the glider revealed the tail section of the glider received structural damage. The pilot stated he did not experience any mechanical problems with the glider before the accident.