Please explain. I've mounted mine with a spring-steel-type of washer. Would a crush washer throw off the alignment? Will my spring-steel washer throw it off???
You should use these to ensure your muzzle brake/adapter is one correctly.
https://www.griffinarmament.com/griffin-shim-set/
"Shims are necessary to provide precise perpendicular alignment of the muzzle device with the thread shoulder of the barrel. We do not recommend the use of anything other than shims for installing muzzle devices for silencer mounting applications."
To answer your question, maybe (God, I sound like Kirk Freeman). You might get away with using a crush washer, but you increase the chance of a baffle strike when you do.