As the light fades in the late afternoon, my failing old right eye doesn't pick up the aftermarket rear aperture very well on my wonderful Benji 392. These sights are great, and it's my eyes that are the trouble. Has anyone found an inexpensive fix for a dark rear aperture? I wondered about trying to use white paint inside the rim of the aperture, and also some orange fluorescent paint on the front ramp. Tips really appreciated! Thanks . Don.