Summary
The pilot of an airplane with retractable landing gear reported an incident during the landing roll.
Narrative
During the landing roll, the pilot inadvertently moved the landing gear position lever to the "up" position. He immediately returned the lever to "down," but observed the left wing settle slightly. He added power and performed a go-around.
Once airborne, he asked air traffic control tower controllers to observe the landing gear. They confirmed the left main landing gear was "canted inward" and did not appear down and locked.
During the second landing, the pilot placed the gear handle in the down position and observed the gear indicators as "down and locked." During the landing roll, the left wing settled onto the runway.
Damage
The airplane sustained substantial damage to the left aileron.
Findings
The pilot reported there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.