Thermostat direction help.

So here's a pretty boring question for you guys, I decided to do some basic maintenence stuff on my truck lately, new rad cap, coolant flush, oil change and replace thermostat etc. etc.
Unfortunatly when I got to the thermostat I found that the prior owner had taken the old one out, cut out the middle bit and fitted it back in like that.
Not a problen I thought as I was fitting a new one, but alas, I had to guess which way around to fit the new one, and I think I guessed wrong.
I put it with the main body/spring part inside the thermostat housing, and since I didn't know what that little brass bit was I just put it in without thinking about where it should go too.
I've noticed that it warms up faster than it used to, but it's still pretty slow eh.
I don't suppose anyone can tell me which way around it's meant to go?

The spring side goes in the block. The little hole with the thing in it goes up so the air can bleed out of the system and not trap air. The temp gauge and t stat only read water not air so it gives a bad reading!

Aha thanks, gotta fix that this weekend, I had a really bad feeling I got it wrong.
Just realised I put this in the totally wrong area of the forum too... whoops.
Hopefully no-one notices