Starter Clearance Issues
TTI may have a nice little expensive starter to fix your problem. That's one of the reasons that I haven't tried them yet. I don' t want to have to run a special small expensive starter.
Also, is this the 1/2" hole that you are referring to in the picture below? That is a manufacturing locator hole used to position the block during machining. It is no longer needed now, you may grind away at it as you need....
View attachment DSCN3906 b.jpg