I don't think it can be emphasized enough...when installing or repositioning the concentric knobs, very LIGHTLY tighten them. The light blocker strips in my new K3 were not properly blocking the front panel light from showing through the buttons. To correct this it necessitated removing all the knobs from the front panel. When I replaced them, several crumbled when I tightened the screws. I know, this has been covered many times before, but I did not know JUST how fragile these knobs are. From now on I am going to tighten them only until the screws touch the shaft. Roy Morris W4WFB
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