I don't have a 2020, but I do have several AT mics. Some of them open up by unscrewing the top half from the bottom half. I don't know about yours, but you want to look for a "seal"...a line that looks like a joining place for the 2 halves. Anyway, A-T has a real good tech support team up there in Ohio. Go on their website and ask them about this. Remember that this "mod" will void your warranty, which is probably moot in that A-T gear rarely breaks down in the first place.

I recently bought an AT 2020 and would be interested in your success with this mod. How simple was the process and what was the sonic result. Thanks

EZ