Jelqing, Clamping, Hanging, Extending.

How do people feel about combining the acts in succession for length gains? i feel like Vacuum hanging after clamping might do damage to the head. Anyone ever tried this?

No , but you do have to watch fatigue levels and attachment techniques when using devices.

I think when you’ve completed enough newbie work to know your unit and you use safe practices you can play around with combinations of exercises to see what works for you.