Hello, I have my great grandfather's Winchester 1873 carbine, 44-40 wcf, 1891 production and have recently been shooting it. Question is how to raise the front sight? I see no way to lower the rear ladder sight. At 50 yards I need to aim 8 inches low, at 100 yards I need to aim even lower, I am using the 44-40 Winchester Cowboy ammo. Thanks in advance for any response