The Incredible Mr. Fix-It by Russ Crossley

Hank Mueller has been a tinker since birth. He owns a tinker shop known as The Incredible Mr. Fix-It because he can fix anything, even things he sees for the first time.One day the U.S. Air Force asks his help to fix a very special thing. A captured UFO. A tale about a man with a special talent faced with an unusual problem. The ending will surprise you.