All of the CVA parts were purchased by Deer Creek Products of Waldron, Indiana telephone 765-525-6181.
But they won't have a replacement frame.
If you can, post a photo of the hole that opened up.
If the arbor is tight then the hole may not cause any functional problem at all.
There's also a "steel washer" fix where a thin rimmed steel bushing can be fitted and inserted into the recoil shield at the back of the frame.
That helps to prevent the brass frame from being batter by the cylinder during the recoil of firing.
Read posts #5 & #6 in the thread below describing how to install the washer. The poster named "rifle" is also a member of thefiringline and can be asked for advice by sending him a PM.