1) First of all, go to your favourite hardware store and buy 16 hooks, as you can see from the picture.
Every hook has a length of 2.5 cm and a breath of 1.2 cm. The cost of every hook is about 0.20 euro, so the total amount will be 3.20 euro.

   2) With the space furnished by the original Detolf, we can store only 12 diecast models (1:18 scale): it's not enough for us, so fortunately, there is the possibility to insert other new shelves: in this way, after this modification, the display case will contain 24 diecast models (1:18 scale).

   3) Empty the display case and put all your 1:18 diecast models in a safe place (far from your children or your wife!!).

   4) Now, remove one shelve and bring it to your trusted glazier. He will use it to create other 4 identical shelves: the price will be about 10 euro for every shelve, so the total amount will be about 40 euro.

   5) Then remove all the 3 left shelves and begin to apply all the hooks and the metal structure: put every hook in the middle point, so every shelve will have the same space.

   6) Here you can see how it appears the hook mounted in the front part of the metal structure. Remember to bind all the screws.

   7) Here you can see how it appears the hook mounted in the rear part of the metal structure. Remember to bind all the screws.

   8) When the new shelves prepared by your trusted glazier are ready, install them on the display case, putting every shelve on the original supports and on the new hooks.

   9) If a shelve does not perfectly rest on an hook, unscrew the screws and correct the position, until the shelve is not perfectly steady.

   10) When all the shelves will be steady, your display case will looks like the picture on the left.

   11) Finally, it's the time to fill the display case with our 1:18 diecast models.

   12) Now, your display case it's finished and you can appreciate your job. You have doubled to capacity of the IKEA Detolf and in the same space you could store 24 diecast models (1:18 scale).