I’ve got an AT2020, so far I’ve been using it fine on its tripod but I want an arm.
Those basketball-hoop-looking things that the microphone goes in though, are they a one-size-fits-all? I’d hate to get the wrong thing…
I can’t speak for all mic arms but mine (the elgato LP arm) came with two adapter screws.
Also,according to the article below, your mic should have already come with an adapter as well.
https://voheroes.com/how-to-attach-the-at-2020-to-a-standard-microphone-stand/
Mic arms will have a tripod style screw mount at the end and then will probably come with several different pieces that can fit on the end. The one you’re describing is a shock mount and they should list the microphone diameters they accept. You’ll probably also be able to directly mount the microphone or use a rigid clip.
I bought this one a few years ago to use with my Samson Q2U: https://www.amazon.com/gp/product/B07X1ZWS2H The shock mount doesn’t fit that microphone but the clip mount does.
Boom arm is the big arm the mic goes on. Mic shock mount is what you’re talking about, this reduces noise from your desk. Hiss / pop filter is the fuzzy thing on the end
