Genuine Victorinox Swiss Army Large Replacement Scissor Spring
Fits 91mm and longer Victorinox Penknife and Swiss cards produced after 1995
(To find length of knife, close all blades and measure end to end casing length)
Part number A.3757
I also supply most other Victorinox replacement parts including springs for smaller Tools - Please see other listings
If in doubt about any item or need technical assistance please just ask.
This video gives you an idea of how easy it is to change the spring. You can use a screwdriver or nail or similar instead of the special tool.