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There's a small washer between the bolt and cap, which has always been in there
The washer on the SRAM ones with the conical bolt head goes under the bolt, there shouldn't be a thrust washer between the bolt and extractor ring. The ones with a top hat bolt head use a thick washer under the bolt and a thin thrust washer between the bolt and the extractor ring
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I gound a thick washer that must've been between the bolt and extraction cap. I'm not sure if it was originally flat, but it's concave now. The one in the top picture seems flat, which leads me to believe I've messed up somewhere.
That's reassuring to know that I can unscrew the bolt and replace it when the new one comes. Thank you!
The bolt is currently tightened into the crank by about 40nm, to confirm it won't take that much to unscrew it? I suppose it's already done the job of screwing the crank together...
I'm worried that I'll shear it by trying to unscrew it.
I think it was my fault. The extractor cap wouldn't sit flush, despite being installed the same way it was taken apart. There's a small washer between the bolt and cap, which has always been in there and is preventing the cap from sitting flush.