I see there is a mod for last shot hold open available for the Phoenix .22 It is a mod for the magazine and not very expensive either. Don't have a link for it, but google it and will come up. They are for sale on Ebay too.
Today, I received new recoil springs. Spring got weak and would not strip round off clip and load next round. I see the origional spring had gotten shorter and weaker through use. Hopefully this will put my Phoenix back into use.