I need to take out one shelf from my kitchen base unit to make it bigger space. but I could only see there are 4 white plastic discs underneath the shelf at four corners. They are about the size of a 5p coin. They have a slotted tread on it just like a slotted screw. I tried to turn it using normal screw driver, but it's really difficult as the tread is not deep enough i keep losing it.
so few questions:
1. Am I right to turn these white disc in order to take the shelf out? if yes, anti-clockwise?
2. What tool do I need to turn these discs?
Thanks for your help.