Thread chasing combat wheel assembly studs

I've been searching the forum for a while now and can't find an exact answer to this. I'm breaking down two combat wheels to replace the wheel o-rings. The first came out just fine but the second the studs are pretty rusty and I would like to run a thread chaser down them. This is for the studs holding the two halves of the wheel together. It's an M923A2 with the combat wheels. I believe they are 3/4 fine thread, but I've seen 3/4 - 16 fine and 3/4 - 20 fine.

Hoping someone can clarify so I can order the correct thread chaser.

Thank you in advance!

Mine are 3/4-16 but I think there was a different size as well. Maybe 5/8?
My redneck thread chaser.

Jbulach said:

Mine are 3/4-16 but I think there was a different size as well. Maybe 5/8?View attachment 919626
My redneck thread chaser.

Click to expand...

Perfect, thank you! Mine are the 3/4 studs. Love the tool you made too!

The ones I've been around are 3/4-16.

I like this - https://jawco.com/collections/indiv...and-taps/products/3-4-fine-nf-rethreading-die

Hex on the outside means you can run it with a deep socket.