Meh. Undoing a total of three screws, and swapping in the parts is hardly butchering it. That's the barrel retaining screw, the two screws that hold the lever and block in place. 100 percent reversible.
Myself, I'm not that enthused to be dickin around with the low end of the power scale on an antique, when I have a bunch of 22's available that I can shoot at the same ranges. Antiques on a centerfire case, though, I figure to be worth the bother. Different strokes, eh?
The new versions of the Favorite look kinda cheap and nasty to my eye. The build quality just ain't there. And they want too much for them, too,IMO.
Cheers
Trev