How to remove a screw inserted from the wrong side in an IKEA ALEX drawer unit

drawersremovalscrewsself-assembly-furniture

We just bought an IKEA Alex 9 drawer unit. I assembled most of it without difficulty, except for step step 25 from the assembly instructions. I wasn't paying enough attention, and screwed the screw in from the outside of the drawer through the drawer castors/slides, instead of from the inside out as the instructions show. This means the drawer won't close. I've managed to get the drawer out from between the castors, but I can't get the screws out from the castors.

How can I get the screws out of the castors? If I try just unscrewing them, they just go round and round. (I guess either the thread doesn't go all the way to the head of the screw, or I've damaged the thread of the screw next to the head). I've tried applying pressure from the end of the screw while unscrewing, but that doesn't help. Any suggestions?

Some photos:

A view of the screw head from the outside

A view of the screw thread from the inside

And this is a view of the thread on the castors/slides (from the outside) from one of the ones where I haven't put the screw in yet. You can see that there is a little bit sticking out with some thread on the inside:

The thread on the castors

Best Answer

As you turn the screw to unscrew it, press on the "point" of the screw to counter the force on the screwdriver trying to push the screw back into the drawer runner. That should allow it to unscrew.