01-19-2011, 12:42 PM
My 650 does not, and doesn't appear to ever have had, this mechanism. The 37-620 I just finished does have it. It also uses a different "lighted arrow" mechanism. The 650 uses a simple plastic mask with punched holes to create a little lighted arrow-shaped area. The 37-620 uses a plastic mask with a single vertical slit in it behind a glass rod which acts to focus the light into a thin bright vertical line.