it is but you have to get dirty. 13mm and 17mm (IIRC). adjust to 3 clicks. going to have jack a whell up to get drum to spin by hand. use adjuster nut on drum to tighten til won't spin, than back off a click or two til it will without resistance. that is using 13mm wrench
if you fell you need to shorten cable, then it gets more painful. well covered in manual.
ISIL and al qaeda can go F*ck themselves...