Summary

Clamp to prevent pergola sides from inching up during windy weather.
Asymmetric to fit in the slot just above the side rail.
Based on a remix from https://www.thingiverse.com/thing:3075868 which is itself a remix of https://www.thingiverse.com/thing:1920577

I found that the base needs to be thick and strong to prevent cracking so i printed the main part of the clamp in 100% infill.

I also use one on each side of the bar at the bottom of the blind.