What is the difference between Powel Lock and the Big Draw?

Hello all,

since this is my first visit here I would like to ask you to be patient and if my question is already answered please forgive me for asking it again.

So, in one of Mantak Chia’s book that I have been using for many years now (Male Sexual Cultivation I think), Mantak Chia sais that we start doing the Power Lock when we are close to a level of 98%, or 99% percent before ejaculation. On the Big Draw though, he mentions that when we have the slightest feeling that we are about to ejaculate we start performing the Big Draw.

Now, my question is: when is the moment that Mantak Chia describes. Nowadays I do not go beyond the contractile phase. But today as I was lying on my bed and thinking about it, in the past when I was ‘single cultivating’ I would go as far as the point of no return to each really early stages when I could feel the needle like pain of inevitability of ejaculation. If I even waited a few seconds, I wouldn’t be able to stop ejaculation.

I also would have high heart rate building up, like the heart rate I experienced when I was regularly ejaculating in the past, which now I try to avoid. I try to keep my self calm these days during single cultivation.

And to continue with my question: When you perform (or performed in the past) single cultivation do you jump over the point of no return and do the Big Draw or before? If you do, do you have the same experience as me, you know the coming of the sort of needle like pain and high heart beat? Do avoid going that close to ejaculation when you are single cultivating or you just approach ejaculation and do the Big Draw.

Thank you for your time everyone,
I’m eagerly waiting for your answers….:)