They used here springs (omega shape) instead of screws.
Yep, I have 230V
Each regulator has ceramic or tape to isolate from heat sink. But this one was filled up only with more than enough paste,
Maybe the earlier owner broke it or forgot it (my speculation), but anyway somebody did something in it earlier and was more beginner then I. He forgot to check it with multimeter,
The heat is coming from another part of the power supply from another regulator
""" Absolutely not!
Sounds like your "fix" didn't cure it - something's very wrong and you better get it fixed before it burns down your home. """
I guess I should buy another one which is a new one this time,
Thanks for your reply !!