Simple, just call customer service at H&R1871 yourself and have a set sent out. Put it on a credit card, they will send them out today and when they arrive put them on with a (small) screwdriver or allen wrench. Ask CS if the sights are attached with an allen wrench and if the allen wrench and screws are supplied, I am sure at least the screws are supplied and the allen wrench might come with them also. Another route to go is to call Williams and buy a new set of thier Firesights to fit the Huntsman but I think the prices from H&R are a bit better for the same item....<><.... :grin:
(P.S. you might think about changing gunshops/gunsmiths or doing research yourself, this forum is a great place to start...)