I need a clever substitute !

It seems that every small appliance
comes with thes little press-in button feet.

I swear, someone comes at night and steals the damn things.
I've got everything from coffeemaker to humidifier
tottering on two or three "rubber buttons".

Every one's a different size, and my local ACE
has no replacement/substitutes.

I was thinking of a squirt of silicone gunk
in each hole. .... ( enough to make a "bump" )

???