This may seem a bit ~*mad*~ but perhaps an even easier and pragmatic way to *keep* the pot stems upright ALL the time, no matter what:
Without even having to open-up the Virus, providing one's pots are all okay or have been fixed per this great post--could one just remove only the knobs and place simple black anodized flat washers that are small enough to where one would not see it once knob is replaced, making sure the center hole in washer *just fits* diameter of encoder/pot stem, and affix flat washer to flat Virus fascia, centered, thus not ALLOWING any side to side play in first place?
Plastic washers can even be found if friction of metal against plastic stem is a worry and super glue GEL would spread less and on that note, less of course is best, making sure it's adhered by four equal points. The tubes allow you to have needle-sized applicator.
Am considering doing this as a preventative measure since both the KB and KC are far out of warranty and in event some day it were necessary to open the hood and the tolerance would not allow this as freely, they would be simple enough to remove/replace. However, even if the washer's inner circumference is not *right on shaft*, having less tolerance for eventually moving can only help.
This would give stability but cannot stress how important it is to not use undue downward pressure on ANY encoder/pot as well to avoid calamity.
Lastly, never loan your Virus out to anyone in first place
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Feedback and criticism on this caffeinated A-ha Moment is most welcome!!