well to fully understand archer you need to read UBW but about the swords,shirou has minimal knoloege about how the sword is constructed but he can't reinforce something he can't see or know with any knowlege of it's form and substance.
you could have seen he could reinforce basic stuff like polebars and wrapper paper but in order to form excalibur he needed to project the mental image he saw. which has a more downside than reinforcement.
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