Need help to put gear shifter back together!
Looking at Shimano Technical Docs there are these pages:

https://si.shimano.com/#/en/search/Keyword?name=sl%20tx30

https://si.shimano.com/pdfs/ev/EV-SL-TX30-2493.pdf

whether there's enough detail in that exploded image I don't know!

Is it the left or right hand shifter?
If its the right hand one , I have one you could have cheap (I'm in the UK)

Cheers