Is it just me?
I'm a bit paranoid about breaking spokes 'cos I've forgotten to unlock the built-in wheel lock. So far I've broken one "rubber bolt" on my Urban Arrow & on finding the replacements were about £10 I decided to look elsewhere. I couldn't find another source but did hit upon the idea of using a nylon bolt which was cheap.
I've been trying to get myself into the habit of spinning the back wheel with my foot before I get on, but today I forgot - low & behold, the nylon bolt snapped - working perfectly!