So my take is that .5mm would be there is the slightest amount of play in the cable holder on either the servo side or the valve side.

Better to err on the loose side than tight?

I suppose another way of looking at it means .5mm is adjusted perfectly.

Dana
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2016 Husqvarna 701SM
2021 Husqvarna FS450 supermoto
2014 Honda CRF250R supermoto
1995 NSR250r MC28