Was playing around with the left shifter, er, brifter, and found a little ratchet that seems to hold cable after shifting. This reddit post verifies that's the one to remove to convert shifter into a dropper control. They take it apart, while they also have link to YT video of a guy who drilled holes in assembly in order to disassemble and remove the part.
I've converted my gravel bike to a 1x11 and had been thinking of buying a left shifter specifically made for controlling dropper (& hydraulic brake), but hit upon idea that this might be possible instead.

These are pretty fascinating mechanisms.
https://www.reddit.com/r/gravelcycling/comments/16svlb6/shimano_grx400600_dropper_post_conversion_mod_how/
#BikeTooter #Brifter

hot take (from the workbench): 5% of youtube videos are painfully long advertorials claiming to teach repair/rebuild #shimano #sti #brifter‍s but actually just show blubbering dudes blasting gallons of #wd40 into their f*ing shiftting levers. wtf.

#bike #cycle #bicycle #repair #BikeWorkshop #DIY #schrauben @fedibikes #fedibikes #mastobikes