Yep.
I have an old Colt revolver. Sent an email to Wolff Springs to see if they made a lighter mainspring.
Wolff said it depended on the spring's configuration. Apparently, Colt changed the spring's configuration slightly through the years.
Was about to describe it in print, when I realized "Why not take a photo?"
So, popped the sideplate off and took a photo of the mainspring.
Wolff sent me a reply in minutes: Nope. Don't make it.
But that quick, digital photo saved me a ton of writing and inquiries.
Love the immediacey of digital photos.