What is a good way to strengthen (prevent rips) craft foam?

I spend a lot of time making LARP/Prop weapons and I have a particular sword that has a very weak guard (That's this http://www.instructables.com/id/Ninjato-30-Alt-Z/). I end up fixing it after every rehearsal, because the foam rips (See the pictures and you'll know exactly how that happens). I'm lo...
By: Sadi789

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