Have you misplaced your attachment base keys or purchased a Mini with a Sport-Link System but no keys to unlock the attachment base? Possibly the lock has fallen out for some reason. We sell replacement Locks w/ Keys. Due to matching capabilities we can no longer sell these two items separately. If you misplace just your keys, we can not guarantee that we will have the correct key code to match the lock any longer, therefore we recommend replacing the entire lock and key system.