I thoroughly cleaned the BB switch again. I also put a little strip of insulating tape on the underside of the aluminium button just in case that was somehow causing a short.
And my MK mods clear panels arrived from FT today.
So far, so good. No signs of auto-firing but I'm not leaving it unattended.
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Hope its sorted mate.
How did you clean the switch? I just spayed it with contact cleaner, and blew it with compressed air. Don't know if it did anything as its sealed.