I wondered why I could not properly adjust the height or the angle of the blade. When I looked closer the whole of the motor / blade mechanism had come loose from the u shaped brackets that control the travel and precision movement. I was able to remove one bracket and realign the whole mechanism back onto both brackets. I then for safety sake checked all clearances and adjustments prior to switching the machine on. All this rather than dismantle the complicated stand and repack the whole thing back in the box, what a nightmare that would have been. However this happened I have no idea, only that it all came adrift in transit. The unit now seems to be working really well and does a good job. Time will tell how well it works on my DIY jobs.