I have finally been able to go to the local car parts shop and buy some springs for the gimbal. Here’s how it looks now:
I should start by saying it works just great. These springs are from some Lada’s clutch (i think they’re for the pedal), they are 55mm long when compressed and about 11mm wide. I am pretty sure any similar spring will work great, just pick one with light or moderate tension.
More (a lot more) below!