Model 41 Wolff Springs

I am considering tuning up the springs in my pre-70s Model 41, which is just starting to fail on feeding and extracting.  Could be magazine and/or extractor, but thinking a new recoil spring wouldn't hurt as a starting point.  What would a good start be for selecting a Wolff spring?  I have no idea the weight of the OEM spring, so I don't know where to start with a replacement (Wolff 6#, 6.5#, or 7#).
Cheers!

I called Wolfe and told them what I had and they told me what springs I needed.
Installed them and gun ran perfectly afterwards.

Thanks, I'll give them a call Monday!

Wolff web site says 7.5# standard (SKU 46775).

Model 41 recoil springs listed about 1/3 down this page:

https://www.gunsprings.com/SMITH%20&%20WESSON/NUMBERED%20SERIES/cID1/mID58/dID261#876

Make sure you install correctly no matter which weight you get.  Wolff recoil springs have an open end and a closed end with the coils in the spring.  Make sure you put the open end towards the trigger up against the frame and let the closed end ride the recoil spring guide.  If you reverse this the open end will chew up your recoil spring guide with deep gouges and you will either be buying a new spring guide or polishing out the old one.  Don't ask how I now this.

Virgil