How to do expansive clamping?

I can t get expansion during clamping. I can t get that discomfort I get during pumping, clamping feels like nothing. I can t stay erect without porn.

I m not able to get 100% erect before clamping, at most 95%. Probably why I can t get expansion.

I ve still made girth gains with my poorly executed clamping but I know I could progress faster if I got this exercise right.

I ve tried so many times so clamp and I only got it right maybe once or twice. Every time I clamp it makes me want to do self harm. How do you this shit right? I m desperate.