Good mower but has weak points

Initially I found this to be an excellent mower, reasonably priced, very powerful and handles even very long grass. I was very impressed by ease of use. HOWEVER, on only the second use one of the front wheels became wobbly and the sprung height selector spun off the retaining clip. On inspection and dismantling, the cast wheel bearing had sheared which was causing the wobble, and that wheel would not self propel. I have ordered 2 spare bearings as the other side will probably break as well. Unfortunately I lost the receipt so can't claim under warranty which is annoying. The poor design point is that the drive to the front wheels is offset and not through the central spindle, a geared spigot wheel drives the notched inner circumference of the driving wheel, AND it is metal turning plastic. It is obvious that I will soon also have to replace the front wheels (nearly £30 each) If the driving wheel design was made more sturdy I would rate it 5/5