My uncle gave me this cool Heathkit OL-1 scope years ago and I never used it. I obtained all the documentation, cleaned, re-capped it and fired it up and everything seems to work. Problem is that following the start up instructions I can't get a solid spot. All settings are per the instructions with the vertical and horizontal gains zero-ed of course. I get a 3/4" diagonal line like a forward slash. Anybody have a suggestion?