Ikea LEIRVIK Bed frame squeak suppression

One of our Ikea LEIRVIK beds was made with removable feet unlike the other one. this cause horrible squeaking every time someone moved on the bed.
I created these washers to hopefully eliminate the noise. It didn't completely eliminate all the squeaking, but it brought it down to a normal level that guests can handle. It's now about what you'd expect from a metal framed bed from Ikea thats more than 10 years old.