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I would echo this as it can be done. I have converted many of my SRAM cranks over to 1x, no issues. All new SRAM specific 1x chainrings come with the kit to complete the conversion. Where you might run into issues is if you convert the SRAM RED crank that already has the tab bolt on the backside of the drive-side crank arm. This would require a spacer of some sort as the inner chainring is somewhat of a spacer in a 2x configuration. Only the SRAM RED Quarq version and SRAM spider cranks do not. Can't recall if they, or someone else like Wolftooth, made a kit to convert 2x into 1x on these specific cranks. Hope this helps.
I have a couple of 1x bikes with a non-Sram ring mounted on a hidden bolt crank. I simply removed the spider, mounted the ring, reinstalled spider. No need to press adapters, etc.
- Using the old chaining 2x bolts: knock the knurled bolt out of the old chaining (may need to whack it with a hammer) and insert it in the new ring. You will need to get some chainring bolt spacers (as the 8mm 2x ones are too long for 1 chainring); or
- Get new 6mm 1x bolts. Use one of these for hidden bolt too (no knurled bolt).
In both cases, if your crank is the Sram Red without a removable spider, you probably wont be able to tighten the hidden bolt to spec (even the knurled bolt in the new chainring may slip). I've found you can tighten it "enough", and as long as the other 4 bolts are tightened to spec, you shouldn't have any issue. I've never had.
If you have a removable spider, remove it to be able to tighten the hidden bolt to spec.