There's been lots of talk about how to make the Kallax/Expedit system even better, with talk of costly wooden pieces stuck down, or even use of multi-coloured "pool noodles", but this simple and cheap solution did everything I wanted it to to make my against-a-wall vinyl storage all the more uniform. * For those wondering, I used the 1-3/8 inch ID x 1/2 inch wall x 6 ft pipe insulation, and installed it bottom/back of each hole. I cut it purposely just above 13.5" so it'd stay in place at the back, and since all the ones I did are flush against a wall it wedges them in perfectly, allowing some spring when inserting a record, but blending into shadows when the cubby isn't full. SUBSCRIBE to our channel: https://www.youtube.com/thatshelf?sub_confirmation=1 Twitter: http://twitter.com/thatshelf Instagram: http://instagram.com/thatshelf https://letterboxd.com/ThatShelf/ Facebook: http://facebook.com/thatshelf Official Site: http://thatshelf.com