I've been asked to help a friend of the family with the firearms from her late husband. I'm just not sure what to do with his Iver Johnson Uberti 1873 Cattleman .357 mag. I've never seen a bore so caked with lead build up, the front sight has been filed off and the cylinder won't lock up. I took it apart and found a broken spring causing the lock up issue. Wolf springs has them for a reasonable price but looking at the other internals they are aluminum and worn. Probably looking at $70 in parts. Does it have any value if it was in working order? Is .357 a desirable cowboy action round? Can I JB weld a front sight back on or does it matter? Thanks for any input.