You've gotta be carefull not to force them too hard or you tend to push through the end of the groove !!!
Looks GD ugly, see attached photo, sorry photo large to upload (192k limit ?) , Mr Doug you're gonna hate me.
Anyway a set of Betti wedges with groove sharpener scratches straight across the toe black of the face.
Sold them straight off, couldn't look down at them without thinking TWAT.
Regards
T