That's very helpful, Nigel. I returned to Freebird after a month's absence to find three of the cupboards stubbornly refusing to open. I had to use antifreeze spray and 3-in-one oil to free them as an emergency measure (all I could find at 9pm!) and then cleaned and lubed them with a silicone lubricant. Totally agree about WD40 except for emergency freeing of stuff - so I'll try the PTFE product next time I'm up!