With the help of 2 redditors, I managed to restore a ThinkPad R400 to its former glory! : r/thinkpad
UK Black (with pointstick) keyboard assembly - Lenovo ThinkPad T61/R60/R61/ R400/T400 - 42T3297 - Tekeurope
Lenovo ThinkPad T400/R400 Recovery Discs (Windows Vista Business x86 SP1 - English) - 46U9738 : Lenovo : Free Download, Borrow, and Streaming : Internet Archive
With the help of 2 redditors, I managed to restore a ThinkPad R400 to its former glory! : r/thinkpad