In article ,
Brian Gaff \(Sofa\) wrote:
No the loose particles might get into the food.

I assume you have gone around the edge with a thin knife to see if its
hardened grot that is the problem?
Seems odd for it to be a screw in type, most of the ones I've seen have
some kind of latching device that pushes pulls or twists.
Brian

where it's located makes that an almost impossible project.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle