Thank you for the suggestion. I've just tried this, but it doesn't make a difference
Edit:
I have found that one way to work around this was to make two lifts which act as supports to one large slab.
For example, two bars with one flat slab resting on top of them. Its certainly not an ideal solution, but I can't find any other way to get around it. If anyone can shed any light on this, I'd really appreciate it. It took me over an hour to find the right balance to have the two bar-lifts work, and it'd be much easier if I didn't have to do this every time.
In the tutorial, I noticed that for the lift all the parts were joined together. I have tried to replicate this in my project by dragging and dropping them into each other which works, however when the lift is used, only the item with the script attached to it moves and it leaves the rest of the items behind. How can I change this?