Earth said:
Don't really know what part you're referring too...in any case, pickguards can be filed and sanded.
There is a ridge halfway down from the top of the pickup to the bottom that runs horizontal. I can feel it through the ribbon. It causes the pickup to stop going up through the pickguard when it is 1/4" up above the pickguard. Maybe it is on purpose so you can't put the humbucker up too high? All the other humbuckers I have slide through it fine.
Here is a pick. There is a ridge that feels like it goes all the way around the pickup where the red line is.

DSC09156 by Hentai No Baka, on Flickr
What you see in the pics below is the highest I can have the pickup up before it hits that ridge.

DSC09155 by Hentai No Baka, on Flickr

DSC09157 by Hentai No Baka, on Flickr
Do you think I need to sand it or is it probably high enough?