Just on a "personal" note. I was/have/cannot shoot a Ruger well. Even after all the years working on these fool contraptions, I cannot explain WHY I can't shoot a Ruger well. I just spray lead everywhere. I built myself a total of 6, yep SIX sets (glutton for punishment) of them before I gave up and just stuck with what works for me (Colt pattern guns).
I set up a whole pile of Transfer Bar guns. Not difficult to work with but inherently "loose." Precision instruments they are not. I was also an outspoken critic of the early attempts to make Rugers work like Colts. The early "half cock" guns folks built were outright dangerous.
The guns did not have a "half cock" notch. Just a ledge, same as full cock. Think about that for a second or two. Then some started welding up the hammers and pulling the transfer bar out. Still without a half cock "notch." Just that stupid ledge. Go ahead. nudge the trigger while spinning the cylinder for high primers. Erk.
It's my understanding, the Ruger Gurus are now doing the full modification to make half cock an actual "notch." I certainly hope so. But, anyway ........
I like "pushrod." I don't use that silly little Uberti plunger and spring. I use Ruger parts. More of a "pushrod" and a stouter spring. I am curious however. What size rod/drill are you using to make your pushrod?? And, Who's coil spring?? While what I use works a treat, I like the possibility of a fatter pushrod.
Like a thief in the night ...... I am always willing to filch the better idea