Are there any options for armrest angled spacers that are similar to the Aerocoach ones (https://www.aero-coach.co.uk/...arm-rests-p202129361) but better quality (not 3d printed)?

I had these laying around from when I bought my extensions 4 years ago and the top washer dissintegrated when I tried to tighten the pad bolts.
Either the plastic deteriorated with time or they are just flimsy / a bad idea to begin with.

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What's your CdA?