You could use the Yellow pages or something similar and try looking under air gun supplies etc. You could Google the user manual or repair tutorials if there are any. You could contact the manufacturer for advice. You could see whether there is a phone number on the box if you still have it.
Crosman owns Hahn... See the link below.
I suggest that you go online and search for "Air gun repair" and locate a shop near you for repairs. Hahn/Crosman no longer repair this BB gun.
See the link below for the owners manual.
Paul Francis Hahn has written: 'A manual of artificial radioisotope therapy' -- subject(s): Radioisotopes, Therapeutic use
Hahn = cock; cockrel Hahn = tap (GB); faucet (US) Hahn = spigot Hahn = valve
Kenneth Hahn was not Mayor Hahn. S.S. "Sammy" Hahn was not related to L.A. City Mayor James Hahn or Mayor Hahn's father, L.A. County Supervisor Kenneth Hahn. S.S. Hahn was a Russian immigrant; Kenneth Hahn's family emigrated from Germany through Canada.
Hahn BB guns are owned by Crosman air gun company. The Hahn repeater is a Crosman model 166. See the link below for the Parts and Owners PDF.https://support.crosman.com/hc/en-us/articles/203543160-166-Owner-s-Manual-EVP-1958-1971-
Joseph Hahn goes by Mr. Hahn.
No, Kathryn and Jessica Hahn are not related.
Crosman offers a service to locate repair shops that work on Crosman antiques. See the link below
These guns were notorious leakers. Today Crosman owns the Hahn 45 model air pistol. Crosman offers a free service to locate shops that repair o0lder Crosman models including the hahn 45. See the link below It's also known as the Crosman model 36 frontier.
Ed Hahn's birth name is William Edgar Hahn.