For my Swedish bretheren
OK, let me E laborate...
Looking at your wrist as you wear the suit, envision a long, narrow V, like a slice of lignonberry pie, with the two "legs" of the V at the outermost edge of the cuff, where the suit ends, and the point of the V at the seam wear the seal ends and the full thickness of the suit begins, 2-3 inches up from the edge of the suit cuff. When you cut the V, you can vary the width of the V to fit your wrist pretty tight or however you like. Start with a 1/4" or so and pinch the seal and see if it fits better- if it's still loose, cut the V a bit wider....
I can't emphasize enough that you get the edges really straight and clean and that you follow the glue manufacturers instructions, which with neoprene cement is what I described earlier. Stay away from Aquaseal or any hard drying cement as it will tear from the suit. And don't use oil to lube the suit up, use some watered down hair conditioner.
You're not anywhere near Mora by chance?
sven