Here is a quick video reviewing the mechanical advantages of the Halligan bar.

The only part I don't cover is the mechanical advantage go the pick itself (mostly because I don't have any videos of it). The pick would have the a 5:1 mechanical advantage and is used with a technique called the baseball bat swing, on inward opening doors.

If you need a more in depth explanation of the mechanical Aavantage of the Halligan bar, check out this video:

   • Mechanical Advantage of the Halligan ...