• gad a lock on,
• bad a lock on,
• nad a lock on,
• jad a lock on,
• uad a lock on,
• yad a lock on,
• hzd a lock on,
• hsd a lock on,
• hwd a lock on,
• hqd a lock on,
• has a lock on,
• hax a lock on,
• hac a lock on,
• haf a lock on,
• har a lock on,
• hae a lock on,
• had z lock on,
• had s lock on,
• had w lock on,
• had q lock on

The adverb form for "had a lock on" is "securely" or "firmly".