It's all in the brain. You have to watch what arouses you the most and watch it and live it in your mind WITHOUT TOUCHING YOUR DICK. When it gets super-hard and you feel like you're going to burst, you will definitely get a lot of pre-cum. But this requires quite a bit of time and patience before you can 💷
Thanks for the info Jack777. Every time i do that (not touching my dick), pre-cum oozes, but then it takes a lot of time to see a generous amount. Now when i touch my dick and play it a little, i can not control myself and ultimately i cum which then kills my plan to only collect pre-cum. I dont know, maybe ur right when u say it takes a lot of time, patience plus control to do it.