In reply to sbc_10:
> ... I don't like the culture of paying for quality pieces of kit that have an inherently weak and many times replaceable component. ...
Welcome to the 21st century.
It is ridiculously simple to design bump head parts that last. You can see these on the professional tools and they are not significantly more complex or expensive to make than the ones on the cheap ones. The real extra costs in the professional machines are in the engines and transmission.
The cost of hundreds of customers coming back to B&Q or Wickes or whatever with broken machines must be high. I don't understand why it doesn't pay these companies to troubleshoot this sort of thing as soon as these trends appear and produce what retailing is all about: happy customers who keep coming back.