Best consumer device for structural penis improvement for harder erections?

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I am looking for the wisdom of people in this forum for the current most proven solutions to structurally improve the penis for harder erections, without meds, without trimix injections, and without rings. Basically some device that makes the penis improve as the gym does for training muscles.

Sildenafil, Tadafil, Citrulline Malate and Red Light all seem to help, but I would like to get as hard as possible without them, because the spontaneity of life does not always allow to get the timing right.

In this regard, I heard Ben Greenfield a while ago talking about putting his penis in some device that created micro-damage and then the penis got harder over-compensating (maybe this was shockwave theraphy), anybody that can vouch for some consumer device based on this or other technology?

I have not tried anything yet in this regard, but a google search led to Vertica:
This looks interesting at first, however:
1) The only evidence seems to be a study of 28 people with 89% of users reporting improvements.
2) Some people report burns and ultrasound gel application awkwardness
3) The device is crazy expensive, ~1.8k EUR, not a problem for me, but I don't want to throw away money either

So, can anybody vouch for a device that is generally available to consumers and structurally improves the penis for harder erections? is there any device with more reliable data behind it?
More broadly: Is there benefit in going to a urologist to get a Doppler ultrasound to diagnose venous leakage before trying anything to measure the results more scientifically later?

Thank you!
 
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