[ARC5] Removing knobs

[Scott Robinson]

Well, the screw is probably hardened, so the drill might not work.

On 11/16/19 8:29 PM, Glenn Little WB4UIV wrote:
> Most likely a Bristol.
> If it has been damaged bad enough by attempting removal with the wrong 
> tools, drilling is probably the only option.
> I had to remove a knob from an ARC-5 control head by drilling because 
> previous owner did not use proper tools and attempted drilling.
> If you have to resort to drilling, use a new bit with oil.
> Try a left twist drill bit first, you may get lucky and get a good bite 
> on the set screw and back it out.
> Start with a bit size that will just fit in the Bristol recess.
> When you have drilled to the shaft, go to the next size drill.
> Remember the oil.
> The next size drill should complete the job.
> If you have taken your time, what you will have left of the setscrew 
> will look like a spring when you remove it from the knob.
> 
> 73
> Good Luck
> 
> Glenn
> WB4UIV
> 
> 
> 
> On 11/16/2019 11:08 PM, Waldo Magnuson via ARC5 wrote:
>> As a good friend frequency says, ???Before you do something, you 
>> always have to do something else first.???
>>    Well, the audio volume switch on a C-1254A control unit I???m 
>> matching to a R-13B (108-135 mc) receiver no longer switches.  I have 
>> a new pot with switch to replace the bad switch but first have to 
>> remove the front panel knob. Allen wrenches don???t fit, it doesn???t 
>> seem to be a Phillips, a small screwdriver turns with resistance but 
>> nothing happens. I could resort to a demill (sp) and major surgery or 
>> try drilling out the knob holding screw but is probably hardened .
>>    And suggestions would be appreciated.
>> Skip Magnuson W7WGM
>>
>> PS:  Glad you came out ok Dave. Low voltages can get you too. I was 
>> changing the battery in my tractor and my crescent wrench hit my ring. 
>> I got the ring off right away but even after two years can see/feel 
>> the scar.
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