Try to slide the drawer in and out. If the drawer gets stuck somewhere, investigate and find where it's hitting. (It almost certainly will).
You'll probably need to loosen one, or both of the drawer members and move it up a bit.
This can be done uniformly using cardboard shims. See photo. Place the shim between the drawer and the crossmember. Tighten the bolts again. Remove the shims by "jiggling" the drawer.
If it's hitting a spacer, grind down the spacer.
If the drawer itself is prohibitive in some spots, it wasn't grinded evenly. Grind down the high spots.
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