Here's a good source for keyboard parts: [http://www.thebookyard.com/apple_keycaps.php?cPath=66_98_102|TheBookYard - Apple Keycaps]. The aluminum keyboards use a silicone dome for the spring but from what you are saying here it sounds like you damaged the scissor clip.
Here's a good source for keyboard parts: [http://www.thebookyard.com/apple_keycaps.php?cPath=66_98_102|TheBookYard - Apple Keycaps]. The aluminum keyboards use a silicone dome for the spring but from what you are saying here it sounds like you damaged the scissor clip.