I tried a channel lock, and had poor results, so resorted to my slide puller. It has a  hook on one end, and a sliding hammer on the other. It only took a couple of pulls, rotating the wheel meanwhile, to remove the dustcap. If you don't have a puller, it is well worthwhile getting one. They're cheap and unbeatable for pulling many items.
Phil
'81 Westy
'75 Beetle
'80 Yamaha XS11

----- Original Message -----
From: Evan Mac Donald <macdonald1987@SBCGLOBAL.NET>
Date: Saturday, July 14, 2007 5:34 pm
Subject: Re: front brake hints needed
To: vanagon@GERRY.VANAGON.COM

> Yes, I realized that, but plumb forgot to address that. I was
> worried about the big job of rear brakes turning into a HUGE
> job, because of the unneccessary removal of the axle nut. I
> blame my childrens' ADD.
>
>   And as to the grease cap question, I have used, with
> considerable success, an 18" set of Channellocks, set to the
> raised rim at the rear of the cap. Pull out, and change your
> grip point by 90 degrees every couple of tugs. It will loosen
> the most stubborn dust cap. Maybe not instantly, but it won't be
> long before you can see that stupid, one-use-only, retainer nut...
>
>
>
> Jake de Villiers <crescentbeachguitar@GMAIL.COM> wrote:
>
>   I believe the question was "How do normal humans get the
> grease cap
>  off?"
>
> <SNIP>
>