Ok so apparently the YT video that posted months back disappeared. Some people have PM'd me looking for this video, so I reposted it back onto YT.
Here is me biasing my spider valve 212 MK1. I'm not downplaying that this could be dangerous, but honestly, this is a 5 minute job! All you need is a multimeter and a small flathead screwdriver. Just only touch where I touch and you'll be fine. Don't go dicking with anything else. Cheers!