Yea my guess is the Chinese switches too! Can you recommend any good ones? I looked on rs components but couldn't tell the difference they were between £20-50 each though! Would love to get some to try before the weekend though as tony is coming back down from Leicester to help tinker with it on sat. In the mean time I will swap the x limit swich and see if it's any better but I have a feeling they all need to be swapped to better ones