From my experiments, it works with certain models only, for example the Marine model. You can attach an invisible marine to your host and then attach your desired attachment to the marine. Sounds a little stupid, but it works and I didn't find a better method yet.
Also, your vectors are invalid; you need to take vectors, which are no linear combinations of each other
(it works nevertheless, but you might not get your expected results).
From my experiments, it works with certain models only, for example the Marine model. You can attach an invisible marine to your host and then attach your desired attachment to the marine. Sounds a little stupid, but it works and I didn't find a better method yet.
Also, your vectors are invalid; you need to take vectors, which are no linear combinations of each other
(it works nevertheless, but you might not get your expected results).