I've still got the spring from one of these to swap the tension direction.
Dewit!
Edit:
I did a similar thing with one of the cheap, rattly, 10buck jobbies. Took the spring out and just zip-tied the fucker to the chainstay. Worked fine for Polo. Removing the rear wheel proved quite a mess though.
@Murphy's_Law started
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I've still got the spring from one of these to swap the tension direction.