Ed,

Whether the weighted knobs will cause pre-mature wear to the encoder bearings is undetermined.

However, I would caution you to remove those heavy knobs before transporting or shipping the K3. Any vertical bumps can cause the extra weight to bend the encoder shaft and create "rough spots" in the knob when rotated.

73,
Don W3FPR

On 11/14/2016 8:32 PM, Ed via Elecraft wrote:
Before I install 73inc weighted knobs on my K3S, is anybody of the opinion that 
these knobs cause long-term damage to the PTO shaft?  These knobs are quite 
heavy, compared to the factory ones.

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