On my last XC flight we were on initial climb, about 500' AGL and I notice some movement on the cowl. The fuelhawk (level dipstick) rolls down the cowl to the windshield, down the pilot's side and down to the ground. Not the end of the world, but it left me wondering if I had any other oversights during my preflight. But the rest of the day was fine. The fuelhawk is gone. Ugh.