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I ended up using two springs pulled from a pen, with little metal nails slid into them to keep them moving the right direction. I had to drill an extra hole into the inside of the trigger.

It works reasonably well, but does not feel great, the whole trigger moves and grinds a lot despite a shitload of filing and sanding. The single hole on the bottom is placed in a bad location, it pushes the trigger at an odd angle so it doesn't want to return easily.

If you could find a long, but narrow flat spring, like the follower spring from a rifle magazine, that would be ideal because it would push evenly against the whole back of the trigger.