Got onto a tangent with Blake Thornton about Zodi water heaters which led me
to look at the Lee Valley website then onto the Garrett Wade site where I
found this interesting wrench:

http://www.garrettwade.com/jump.jsp?itemID=105477&itemType=PRODUCT

Claims to provide a 32:1 gear ratio (though I don't know if that truly
translates into a 32:1 mech. advantage).

FWIW

Alistair