making a cuppa this morning and the coffee ran out so had to get another fresh jar when I had a Brainwave.....and yes it sounds a bit.... 
....
Looking at the lid I thought that looks familiar ......
mmmmm I wonder.....had a load of empty ones in the garage so a hunting of I went...
This might make a support foot....
...and yes ...it did....
Even more amazing and by sheer chance these Linn skeetpads pressure fit beautifully into the bottom recess....
so now I can use them inverted .......
Let you know how i go....
cheers Tase.