It would appear to me that the idea of a 'double loop' on airgun shafts without slider - like on the Tovarich - has first been presented by
SVL.
His webpages on airguns maintenance and modifications are getting better and better (
great source of information for airgun veterans and newbies):
=>
http://www.webalice.it/svl555/Sub/fucile.html
Cheers,
ulysses
