Thank you both for the information. As I am rather new to rolling blocks, I appreciate being corrected when I'm wrong. I was recently at a gunshow and passed up a No. 1 action fitted with double set triggers, so I assumed that was a factory option. I will look in to Numrich and see if they have the ...

I realize this thread is ten years old, but is it possible to get a copy of the blueprint still? I have a No.5 I'd like to make set triggers for.

Thanks in advance.