[TenTec] Need knob for Ten Tec 229 tuner

[Dr. Gerald N. Johnson]

Is there a flat on the shaft making the set screw need to be at a 
particular position? Somebody drilled and tapped the knob originally so 
it surely can be drilled and tapped at a new place or with a bigger set 
screw. If its all plastic with no metal, the future in all of those is 
not good. There might be a need to drill and tap at an angle to find 
material to hold the set screw and to still hit the shaft close to the 
panel.

Knobs on my Corsair II, especially the bandswitch knob have broken the 
center shaft socket from the knob. I've fixed one or two by fitting bent 
pieces of aluminum to the space and then epoxied the aluminum bits into 
place. On those the setscrew side was OK, just the opposite side of the 
knob broke from the set screw (and turning) pressure and there was not 
enough plastic anywhere else to drill and tap a new hole. I might have 
done about as well to have just pushed the broken parts back together in 
the center and filled the space around them with a thin epoxy and let it 
cure.

There have been knobs that held on to the shaft by a collet that would 
grab the shaft very close to the panel. I don't have any of those, they 
tended to be expensive. But there might be something of that type at 
McMAster-Carr, www.mcmaster.com yet.

73, Jerry, K0CQ



On 2/16/2011 5:26 PM, David Thompson wrote:
> My air cap tuning knob set screw hole has been reemed out and according to
> the Ten Tec tech I needed a new knob.  I fixed it last fall by pulling a
> larger set screw from a Johnson Brothers vernier.
> Now the larger set screw has also fallen into the knob. so I need a
> replacement.  I inquired about tapping out the hole but I was told that is
> not possible.
>
> I tried using Collins replacement knobs but the set screw is too far toward
> the front of the knob so it merely goes off the end.  None of the Collins
> black knobs will work.  Most of the other knobs I have also have the
> problem.  The Johnson Brothers vernier does not turn the air cap shaft with
> the vernier.  I have to grasp the whole knob and turn it.
>
> I am looking for the air cap knob for the 229 or 4229.  I see something
> similar in the MFJ 2011 parts section.  Right now I have to try and turn the
> air cap shaft by hand without a knob.  Amazing what an additional 1/4 of an
> inch for the set screw shaft makes.
>
> Let me know if you can help.
>
> 73 Dave K4JRB
>
>
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