The graphite latch weighs in at 7 g so the cord to pull in back with weigh almost the same. The shock cork to act as the spring will be even heavier. The latch itself may have to be a bit more robust at the pivot point so it could ends up being almost 10 g. I haven't finished the mould for the post it gets mounted on yet but that will be done soon. For those of you without this on your Borealis I am making it so it can be retrofitted in place with a couple of bolts.
I want to test the latch and see if it can be used as a airbrake for long descents. The latch would hold the door open about 8-10 cm at the front so this should slow you a bit. I can try it on the way to work as on one section of the hill I will be at 70+ kph. Curious to see if this will reduce that by 5 kph or so. I can tell if it works if it slows me enough so that I don't need to use the brakes for the roundabout just past the base of the hill.