Mystery Spring for Vivaldi II S1 plumbed version

[doyourthing]

So I'm putting back together my Vivaldi S1 after a deep descale and pump replacement and I found a random spring on the desk!

Any idea where this part is from in the machine?

It looks like it fits over the pump connection mechanism to the motor but I don't want to make any mistakes here and burn out the motor or worse.

Any ideas?

Thanks!
Rob

IMG_3276.JPG (802.93 KiB) Viewed 3548 times

[chas]

Did you unscrew the expansion valve?