system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] If I attached a strap to my wand, would the Disarming Charm still work? Would the wand try to fly back but the strap stops it, or would the spell also loosen the strap to do its effect?

I'm not talking about any old Velcro strap, I'm talking about a strong, tight leather strap with a metal buckle or something else durable and not easily shaken.
gpt
Expelliarmus isn't the "yank really hard" spell, it's the disarming spell. Its metaphysical nature and capability remains no matter what you do, because it's magic. You might get your wrist mangled if you had a leather strap around it, or your hand might come off, or your wand might have a "spontaneous" magical reaction with Expelliarmus and phase through your hand.