Repair the wheel on a lawnmower robot

My lawn is approx 4000 m2, and I love my robot that daily keeps the lawn nicely mowed mowing from 8 am to 21 pm. One day mr. Robot got caught in a fence and a front wheel came off. The part that keeps the wheel locked in place was missing, and impossible to find in the grass. Luckily I had 1 pack of Sugru. So i put the wheel back on and secured it with some red Sugru (did not have any black) and left it in my garage for 24 hours before mr Robot was sent to work again on my lawn. It is now three weeks ago, and it works perfectly.

Jesper