Boncuk, I don't think that's correct. The O.P. said it's a momentary switch, so it doesn't toggle.
If it is in fact a momentary DPDT switch, then each side (set of 3 contacts) has a NO (normally-open) and NC (normally-closed) contact on the outside, with the center contact common to them.
Just use an ohmmeter or continuity tester to figure out which side is which. If you want the switch to be normally closed, then use the contact that shows continuity (is shorted or closed) with the center contact when the switch is not pushed.