ij was importing 1858's by uberti and colts by asm, 1975-78. they were also producing the black powder revolvers for colt around that time. similar to lyman of that time, i have a lyman/uberti 1858 import in 36. BC, the hammer was so heavy it was painful to cock due to arthritis in my hand. i thinned the spring down and shortened it to decrease the bow.