level

Hi there I am running my SM series 2000 lathe since a few days ago, I noticed that the fast it runs the lower oil level is in the window, after turning off the lathe, the level comes back in the window buy wit a noticeable foaming. I ran it with the upper cover open, I noticed that the input...

I have several vintage levels that have a groove on the bottom. OK, I can understand that these were meant to be put onto something where you just move the level across. However, exactly WHAT would be that something that the levels would be slid across, especially when the groove dimensions...