Theoben Rapid 7 inertia Stainless steel Spring only, for anyone who wants to upgrade the inertia weight spring in Stainless Steel or has a damaged or lost one. I have also put a photo in of our Heaviest Inertia Weight against the standard so you can see the difference. I also do a Inertia Weight that is between the two sizes.
Photo shows the spring and part of the inertia weight, but this is for the spring only in Stainless Steel.

the Last photo shows the standard weight hanging from the spring which when assembled should be able to hang from the spring to work correctly.
I have done a lot of Rapids that have not been done the correct way. That is why I have shown the correct way, they should be put into the hammer, although standard Theoben would put the spring guide at the rear. So would then have to use a steel washer to keep the inertia weight and spring in place. I prefer to gain more by assembly shown.