Had the same trouble with the rocker covers on my Panhead. The front decided to leak 29 years after I rebuilt it. Oil leaked down on the front exhaust pipe and started burning. I stripped a couple trying to tighten them rather than remove the head and replace the gasket. I took it apart and Heli-coiled every hole.
Wow, looks nice! Looks like that was a lot of hell-coils you had to install.
