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I had some success with Bluemels by fettling the bend on the metal stay attachment brackets. I found out the only bit actually making contact on mine when wobbling was the most inward bit on the bracket that steps in and down.
10 minutes of bending by hand sorted it out. IIRC flaring the bracket itself but also bending the tabs slightly outboard so the angle of exit for the stays was more extreme (outward).
I feel like this might have given the stays some outward sprung preload which also helped stabilise laterally ...
Ahhh... I see so it's actually the lack of strength of the bottom struts X the wobbly plastic.
Years ago someone on here used GB struts on Bluemels, I assume for the cleaner look. I wonder if two of those would be a stronger set up?