split washer
I use these on my lamp bracket which is subject to eccentric loading https://www.accu.co.uk/internal-fine-tooth-locking-washers/63051-HIFW-M6-A2
That would've been a good idea but I didn't think about it so, no grippy washers for this setup. I'll just try and pay attention before the light falls into the wheel.
@hippy started
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I use these on my lamp bracket which is subject to eccentric loading
https://www.accu.co.uk/internal-fine-tooth-locking-washers/63051-HIFW-M6-A2