As above really. Nudged by another thread decided to get this one apart to see if we can get it working.
Marked J C Higgins "22" Caliber 12619300
Sears, Roebuck & Co Made in USA Also 992529 on breech cover.

Think we know how it works and seems to be intact but weary in parts. A non return? valve inside the compression tube. Don't want to disturb it at the mo'
Asking them that know. Is anything missing? What's operation sequence please?
Thanks for looking.