Shucks, pull all of them, put them in your ultrasonic parts cleaner and 
be done with it.    Oh, you do have an ultrasonic parts cleaner don't 
you?  You know, the one that's used to clean your dentures.   Those 
things are great!  Not your dentures, however.
73
Bob, K4TAX
On 1/1/2020 11:38 AM, Ralph wrote:
 
Hi Rick,
 I use a soft bristle tooth brush and pull the brush  through the 
grooves on the knobs.
Ralph
w8bvh
 
 
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