Mainsprings for the 1875's and 90's ???

[Jake Stoner]

I know that EMF sells a lightened mainspring for the 1875's and 90's.  Is there any other outfit makin them? 

[Papa Bear]

VTI Gun Parts at http://www.vtigunparts.com/

[Marshal Will Wingam]

I bought a pair to try in my Ubertis. They didn't work at all for me. They evidently are made for Piettas and although VTI told me they would work in Ubertis, they don't.