Thin washer should be fine.
If you get 4+ rotations of thread engagement on the brake bolt then you'll be reet.
Sorry, slow to acknowledge... Cheers though, it was reassuring. Also managed to swap the nut retaining the caliper spring for a narrower one (SRAM one was so chunky!) so got about 8 rotations in the end and feeling less nervous...
@adamdenw started
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Thin washer should be fine.
If you get 4+ rotations of thread engagement on the brake bolt then you'll be reet.