Ctrl key problem

[Filip]

Today I was cleaning my keyboard and I lost one part of the CTRL key (don't ask me how!). Unfortunatelly I can't find it and I can't place the rest of the key into the keyboard. I just need that small part. Is there any way to separately buy keys for the keyboard? I am frustrated with this... I can not leave the keyboard without one key. And I don't want to buy a new one just because of a extremelly small part.
The machine is T43.