Did buy the following spring kit from Brownells:

BROWNELLS : WILSON COMBAT : #321 S&W J FRAME SPRING KIT - World's Largest Supplier of Firearm Accessories, Gun Parts and Gunsmithing Tools

Want to use it on a S&W 340 SC, i.e. a scandium J Frame hammerless gun.

The rebound springs are all ways longer than the original one. Astonishingly the longest is labeled to be the weakest. Is there anything wrong with this?

So far did not dare to mount them.

Thanks for your advice,
Fritz