Of all the keys on the keyboard, replacing the SPACEBAR is probably the most difficult. The SPACEBAR is kept even by a metal wire that is inserted into slots on each leg of the plastic bar key. However, you have to get the wire into the slots without depressing the wire. If you push the wire down, you compress the wire and installation becomes impossible. As a general rule, do not remove the SPACEBAR unless absolutely necessary. If you remove the SPACEBAR, remove several surrounding key caps also. This will let you get some tools under the SPACEBAR wire later on. Once the SPACEBAR is reinserted, you can easily replace any of the other key caps.