Anyone know anything about disc brakes?

I would still try the tape wrap first - if it works it'll make bleeding it next time a lot easier but if it doesn't work you can always go in all (glue) guns blazing.

True. I'm being very imptient after the 3T cracking. I get a new frame and now this. I'm going straight down the middle with some gorilla tape and PTFE. Might as well always ride on the hoods pressing down for good measure too 🤣

Local bike shop ETA for new shifter is...... 22/04/22. Yeah. Good one Madison/Shimano.