Making key in the game Dracula origin?

I am at the point in the game where you have to make a key to open the secret passage way in the house (the one attached to the cemetery in London). I went to www.uhs-hints.com and I did everything they told me to do but I still cannot get the key made. It will only let me cut pieces that are 5 and 4 centimeters and then it will only let me make a handle out of those. Does anyone know what I am doing wrong?