I'm super happy with my GX. I keep trying to convince myself to switch to an X01 or XX1 derailleur because bling blang muddafukka. But in my heart of hearts I know that I don't need to because GX feels nearly identical.
Looks like there might be a shim in there, right above the collar. Not recommended for dropper posts IIRC.
nothing wrong with a shim
Not true. A shim can create extra pressure around the lower body of the post (depending on the length of the shim) that can cause binding with some posts.
Y u no fox rear??? So damn close!! And I ran a shim on my reverb to go to 30.9 to 31.6 and had no issues. Did not use a metric f*ck ton of grease on both tho so I didn't have to reef it down hard to keep slippage at Bay.