I sent an older frame in the week before Christmas, and received it back the second week in January. The conversion cost was $55.00 plus return shipping (I believe it was $7.00 extra). I was told up front that it would take longer than the 2 weeks time stated due to their being closed over the holidays.
The frame returned to me with the newer style hammer and trigger, as well as the pivot pin location changed. The trigger pull had to be adjusted for engagement and overtravel, but then I expected that. Overall I think it was a worth-while investment.
Larry