If you set up a Colt action with coil springs and tuning, you can extend the life of the revolver to that of a Ruger or better. Almost all of my work these days centers around the conversion from flat springs to coil springs. Maybe a handful a year at the most want the flats to remain (collectables usually). Either way, the addition of an action stop and a bolt block imparts a high degree of mechanical accuracy which makes for an almost indestructible action. The individual coils allow for "finer tuning" as they don't have near the stacking that the flats have for the same movement - so there is less stress on the part and the spring (i.e. the bolt hitting the cyl as well as the bolt arm and hammer cam interaction).
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As you can see, the left bolt arm is rather thin and considerably longer which allows for much greater flexibility / longevity and pretty much alleviates a broken bolt arm as shown in DJ's post. The slab side of the bolt block gives overall stability to the bolt and minimal lateral movement which frees up the bolt to do its job of locking/unlocking the cylinder (it also corrects an oversized or sloppy bolt window in the frame).
Also, you can see the original combination spring is "repurposed" to be a "keeper" for the springs and the bolt block. The only flat spring left is the main . . . as it should since it is the best spring suited to move a heavy hammer (Freedom Arms knows this). Coils in this roll are lazy and need to be rather heavy to match the speed of a flat. In fact a flat main can be lightened somewhat and be fashioned to increase hammer speed!! A coil such as in a Ruger can be turned into a "progressive" spring which "fools" the shooter thinking it's much lighter but then stacks as the cycle continues. This is what I've turned to for competition ROA's. It allows faster / easier cycling while retaining sufficient power to smack a cap!!
Mike
By the way, the additional holes in the frame are for interference pins and have nothing to do with the coils. The pins rest on flats ground on the screwpins and are flush with the frame surface. With trigger guard and backstrap in place (yes, there is a pin for the hammer screw as well), the action screws can't work loose.