Protection from disarming (Expelliarmus)

[lazyvix3n]

No: HPFGUIDX 137931

I might have to register this as a patent.

Fred, George, here's my new product and I'm hoping that you might be
prepared to sell it in Weasley's Wizard Wheezes. It's a really useful
item that can be used to protect wizards and witches from disarmament
charms. This may look like an ordinary muggle-household piece of
string, but tie this end to your belt, button, wrist, neck, ankle,
friend or whatever and this end to your wand, Voila! You never need
fear being disarmed again!

And here we have the professional version, made not out of String but
what Muggles call 'Eclastic', this one returns straight to the hand
after a disarming, useful for professionals such as Headmasters,
teachers, escaped convicts...