Those older AT things are easy to get into. You could consider picking up a 40mm driver set from somewhere and doing a transplant to make something great.
I don't recall whether the driver is bonded in there with a mesh over the front of not, been a while. Oh I think the driver is secured in with a ring clamp, and the face of the driver was the thing that had the bonded mesh so it should be fine. IF you decide to.
Edited by nick n - 7/11/14 at 8:37pm