Looking for 10spd Shimano RD jockey spring

[ratherberidin']

So about 60kms in Trans Baviaans last weekend, my pulley stops pulling... The jockey return spring snapped (not the visible spring that sends the parallelogram up and down the cassette, the one inside the clutch cover).

Wondering if anyone has an old buggered 10 spd rear derailleur that I could harvest the spring of? Would like to see if I can keep this groupset together for a bit longer before big spending on 12spd. I'm in JHB and happy to pay in beer or a nominal cash donation.

My floppy chain and I finished Trans after a lot of swearing and the help of some rubber bands.