I always shim, don't know whether it makes any performance difference but certainly doesn't make things worse - in fact on the Durga, shimming stops the hinge pins falling out in crashes.
0.5mm is a rather larger tolerance - I shim to 0.1mm which is the size of the smallest shims in my pack. Parts should move freely under their own weight after shimming. O-rings are a no-no for me as shims as once compressed they cause extra friction, like putting a rubber brake block on the parts.
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