Cut the fork

[Ar26]

Small technical question regarding the cutting of the fork. Until now, I cut my fork at the level of the stem then with the expander I was 2mm above the stem and then I placed a 5mm spacer to compress the headset (classic process). I'm going to build a bike with integrated wiring and the cap is flush with the handlebars and I was wondering how high the expander should be from the top? Still 3mm for good compression? With this system (more aesthetic), isn't the top of the fork buried in the stem subject to too much pressure?
I sometimes see people cutting their fork flush with the handlebars, then placing the cover but I tell myself that there must not be enough compression. Clarification would be appreciated

[Ar26]

Thank you Serge (are you French?). I was expecting your response. I will be building the LCR 017 soon. As mentioned, until now I always put a 5mm spacer above the stem in order to have that 3mm of space for compression. With one-piece handlebars and integrated cables, it's obviously more aesthetic when nothing protrudes but with this system, the top of the fork is at the same level as the upper screw of the handlebars in order to leave room for compression. The expander playing its role of counter force in a way.

[PLA]

Guilty
I stand on the shoulders of giants, nurtured by a culture of patisseries, adultery and weapons manufacturing.
And I complain. A lot. For example I thought my er9 was a piece of shit when it stopped working yesterday. Turns out I just didn't charge it. I blame al Qaeda.

LOL