SRAM Force Crank Arm

I can't get my SRAM Force crank arm off to grease the BB. I have read the user manual, Google'd and YouTubed to try and find out.

It seems you need a 16mm or 5/8" Allen key to remove the locking nut. I got hold of a 5/8" Allen key but I am rounding the lock nut before it moves. (might be because I can only just engage the end of the Allen key.

Any body got some tips or got a 16mm Allen key I can try?

Appreciate the original request is now old but important  to address as it may assist others coming across this issue in the future.

The left arm (non-drive side) Sram Force crankset is held in place by an 8mm hex bolt NOT a  16mm one. It is this 8mm bolt that goes into the spindle end and keeps everything in place.

The 16mm fitting is a cap that fits into the crank arm over the 8mm bolt.  It should not be removed as it needs to be in place  as part of the  crank extraction process.  As you undo the 8mm bolt (in a conventional anti-clockwise direction) it presses against the 16mm cap to force the crank arm off the spindle.  If for any reason your need to remove the 16mm cap it has a left-hand thread ie loosens in a clockwise direction.

Hi Dave, thanks for the advice - I never got the crank arm off so now I know how! Great, thanks. You must have passed you Bike Mechanic BTec. :-)