It maybe on runners you can adjust using a long screwdriver never use WD40 its rubbish Silicone spray or wood slide.
The silicone just disappeared. At least the wd40 has been absorbed into the wood. I think the adjustment is at the top - hidden by an rsj what is wood slide??
Didn’t see that one. I saw Daisy Simon’s brand new painted bus get a whack and a little bit of panic may have escaped him!!!