Yes, as I said I used a "slave" pin when installing the sear spring and the cage has it's own pin.
"Secondly, your saying that the frame behind the mag brake is solid?"
Yes and no, the area has been milled out with a permanent barrier between the mag and the hammer strut and main spring. Sort of a permanent mag brake. Changing main spring is just: remove the grips, remove mainspring plug pin (one only) and the plug and spring slide out.