[Boatanchors] How to bush a knob for a 1/8" shaft

[Darrell Brooks]

Mouser Part Number 506-KR104

Darrell, WA5VGO

On 3/28/2026 10:59 AM, Doug Hensley via Boatanchors wrote:
> I purchased a Millen grid dip meter (Model 90651A) over the internet only to have it damaged in shipping.  One issue is the two front knobs were broken.  As my luck would have it, while the left knob fits a standard 1/4" shaft, the right meter adjust knob is a 1/8" shaft.  Guess what the odds are of finding a matching pair like that anywhere?
>
> So, if I could find a way to bush a 1/4" knob bore down to 1/8" and use a longer set screw, that's my first idea.
>
> Has anyone solved this problem before and have you any suggestions?
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> Doug W5JV
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> Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.
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