Loud grinding noise on rinse cycle, water not draining

Turned off the circuit breaker. Removed the two lower panels below the door. Removed the two racks from inside the tub. Removed the lower rinse arm, then unscrewed and removed in stages as much of the washer components from the inside bottom of the tub. Last item was the unit that screws into the base of the tub, was loose but would not come out, then I realized I needed to disconnect the water lines from underneath the tub. Then I was able to lift the pump/motor assembly out from inside the tub. Disassembled that until I reached the wash impeller, and saw that the shaft was no longer rectangular, but rounded out and spinning freely which was why the water was not being pumped out. Also found a small flip top from a can, no idea how that got down there, but that was what was making the loud scraping noise as the was impeller tried to spin. Reassembled everything and unit now works fine (and much quieter!) Never had to take the dishwasher out from under the cabinet and if I had to do this again it would only take 30 - 40 minutes - live and learn!