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Can this be done? I may have been an idiot and not thought though a purchase (I know I'm not the first, and in my defense, it was an attempt to help my wife...)
Hanger extender thing?
All The B Screw?
I think the max a 2x GRX mech will go is 11-42 but check Gerards blog on 3T as he may well have the definitive answer https://blog.3t.bike/2019/09/11421/gravel-tech-shimano-grx/
Sorry, should have been a bit clearer in my post! It's a 10sp SRAM GX 2x mech 🙂
I made a 10 speed 2x10 GX mech stretch to an 11-42 cassette size but it was a stretch. Not sure if it’ll do 46t but it may depending on your mech hanger and whether it suits it well. Ideally if new I’d send it back and rethink. You probably need to go Shimano Deore in 10 speed to hit that 46t capacity (I think deore does it now)