Thanksgiving in NJ

Back in NJ this year at my son's house for Thanksgiving. We took out and oiled his two Flinters I gave him many years ago. He belongs to a rifle and pistol club, but no black powder around to shoot them.
54 Caliber Pedersoli pistol that shot wonderfully for me 20 year back. And a very Thanksgiving feeling Conneticut Arms .54 Blunderbuss that is very cute and I fired 20 plus years back. The flints are Knapped and spark well, oiled and put away this fine crisp Autumn day.

Ok tragedy !!! I confess my son in moving and a prior divorce had guns stored in a slightly damp area and some had massive rust.The Greener GP and this Armi Sports rate as hens teeth .22 revolving rifle " Remington" were badly rusted.The Greener cleaned up ok, but when I first tried to cock this neat little .22 I felt the mainspring break. It is made in Italy by Armi Sports. I would say early 80 or 70s.It is timed perfectly but no hammer return tension . HELP ! I am not around my big home PC and can't search for parts if any ! I presume it is a snapped leaf type main spring.I don't want to pull gun down into parts and leave back to Oregon.I cleaned and oiled it and put it together. I may have a similar to Remington clone something, main spring .it looks not that easy to access stock and bottom plate and trigger assembly have to be removed. If somebody could give me a lead to find an Army sport revolving carbine parts Id appreciate it.Or maybe an active BP gunsmith on here wants to tackle it and fab or modify something to fit.Like I said gun indexes and locks up perfectly. These are more common in .36 , but I presume main spring is the same.