1. spawn swep you are making
2. attach attachment that needs new AimPos
3. use sliders in AimPos builder to edit it (like in SCK)
4. export modifications either by clicking on code preview or "export all" button - that will copy code to your clipboard
5. paste code into your swep`s shared.lua and save

Where can i find this "clipboard"?

https://en.wikipedia.org/wiki/Clipboard_(computing)

Can I use this to edit vanilla weapons? If so, where do I go to find this 'shared.lua' for the vanilla guns?

You have to extract the addon using "gmad.exe" that is in your bin folder

Yeah, but I said I'm using the vanilla weapons, which are mounted and not actually in my Gmod folder.

Well, idk. You'll have to look into that yourself since I'm only working with INS2 weapons.
But hey, nothing is impossible :D

Oh well, I appreciate your help regardless. Thank you.

Anytime.

How do i access the clipboard can you give me some specific instructions?

Are you new to PCs or something?

No, but I haven't heard of the clipboard.

ever heard of key combos
?

I'm pressing it. But nothing seems to work.

NVM. I got the hot keys to work. Though i'm still having problems with the "export all" option.