DrJ, there’s nothing to stop you deviating slightly from what it says on the website in order to get an even better cup of coffee, it won’t explode or anything 🙂
Agreed that it’s probably not the best present for someone who is 5 or likes to drink coffee from fine bone china.
Incidentally, if you find you’re having to press down too hard, the grind is probably a bit too fine. If I try to use coffee which is ground for my espresso machine I can barely make it depress more than a couple of inches. Filter grind seems to work best for me, or just cafetiere.