I had an IKEA unit that gave a real struggle to move the drawers.
After years of waxing and soaping the surfaces I took the whole thing apart and put 1/16" shoebox cardboard shims in a few places. You don't notice the gaps unless you look for them.
Still, only certain drawers can go in certain slots so I had to glue a sheet with instructions on the bottom of the unit for one of the combinations that worked.
With three equal size drawers and three slots you can have many combinations. The first drawer goes in one of three places, the second drawer goes in one of two and if the third drawer doesn't go you have to start over with the first or second drawer. Keep track.
Last edited by Wuzzat?; 12-28-2013 at 10:02 AM.