If you had the Centa fitted to a car that originally had the Harley type compensator you will have hole in the housing originally intended to grease the compensator. A boroscope through the hole will allow inspection.
Yes you're right. You can. And on all Centa bell houses if I'm not wrong. I've seen precisely Stevo666 doing it in their workshop. But with a boroscope you can only check that the rollers are there, and, unless they miss a big chunk at the front where you come in with the boroscope, you won't see much more. If the rollers are cracked or miss a chunk in the back, you will not be able to appreciate it.
