Hi there guys need some advice about vacuum hanger

Hi there guys , can someone recommend me good vacuum hanger ? And are there guys that have achieved gains with just vacuum hanger and nothing in addition to the vac hanger ? And if someone have achieved gains with only vacuum hanger can he share his routine ?

And guys I have problem with my penis head , when my penis is 100 erect my penis head seems like it’s flaccid ? Only when I am about to finish the head goes fully erect ? What can I do to have erect head when I am erect ? I don’t have erection problems but the head looks like it’s not erect and I want to make it erect ? Any ideas ? Are there guys that have the same problem and how do you fix it guys ?