Hi Gary,

Thanks for the reply,

Dean thought it may either be the linear rails or the screw. It seems obvious to me, given the quick investigation shown in the videos, that it's the screw. I just wanted to confirm that before I ask the company to send a replacement screw. As they're in China I'd hate to have them send the wrong part.

Would you agree then? Based on the videos in my post earlier that it definitely seems to be the screw?