I have used those oval washers in rims that I knew I could have troubles with like for example araya aero tubular rims, those I believe use a tiny insert which obviously is not available anywhere so had to improvise and those washers made everything super easy.
I have used them in used wheels where I knew tension was going to be a problem (tension all over the place), just old rims, and they did what they suppose to do. So as i said before since the idea was to get a low count spokes wheel I wanted to play safe.
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