I got the keys from a 6746 - assuming the 6779 is the same then the keys are buckling spring. You can find the same mechanism in IBM's Model M keyboards - usually there's a few on sale here and on ebay. Go on, treat yourself. The Model Ms are easily worth a try, and with a blue cube or a belkin adapter (other brands are available), they work just fine on a modern pc. You can even quiet them down with a little love and dental floss...