HaloMods "Classic" Read-only Archive

I have been having problems injecting coll models. For example when I inject the giant door and its coll model into blood gulch i can still run through the sides. Can any help me is there a special way of injecting coll models because I have been using hht to inject them and it's not working. Thank you

im pretty sure there are tutorials on how to do this.
search around the files section or tutorials section of http://www.halo-scene.com

I could not find a tut there, does any one know how to inject a perfict coll model? thank you