How tightly should I screw down the top cap?

[Yamahonian]

Changing out my stem and watching videos, most people say only to turn the allen key until you meet resistance, then maybe give in an extra 1/8 of a turn at the most. I did this, and don't feel any play in the headset (though this is my first time).

My bike came assembled, and when I first removed the top cap, I had to use a good bit of force to loosen it. There is no way that they stopped tightening when the allen met resistance.

Now I am not sure how tight to make the top cap. Don't want to damage anything obviously.

 

[smorgasbord]

This will set you up:

If you're impatient, jump to here:

But watch until the end. Basically, just snug up, check for play, tighten 1/8 turn more, check for play, etc. Then tighten up the stem bolts.