1919 pintle pad rivets

[ML_Roak]

I'm working on a 1919a4, how much should the rivet stick out prior to peening when riveting the pintle pad to the RSP? I ordered a set of MSGs rivets, but I wanted to get a head start so I made a couple :mrgreen: (I'm impatient, what can I say).
Thanks,
ML Roak