Thursday Morning Riddle

I help boats through canals so they won’t have to moor;
Help you type in all caps; hold a wrestler secure;
I’m a fix on a target; a win that is sure;
I’m a bundle of hair; and to safeguard the door.

Who am I?

UPDATE: Riddle solved by Tatum. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Tatum Says:

    Lock

  2. Bill Says:

    LOCK is correct. Welcome back, Tatum!

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