[ARC5] need the home-made knob conversion info/video

[Jim Falls]

Got one on my BC-453 like Ken has in his video. Not glamorous, but A-OK. 

Cheers!
Jim K6FWT
CBLA #37

> On Aug 24, 2014, at 8:27, Glen Zook via ARC5 <arc5 at mailman.qth.net> wrote:
> 
> There were a lot of plastic knobs used on things like older AC/DC receivers that had splines inside the knob which matched similar splines on the potentiometers.  These work great as tuning knobs for the ARC-5/SCR274N receivers.
>  
> Glen, K9STH 
> 
> Website:  http://k9sth.net
> 
> 
> On Saturday, August 23, 2014 8:33 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
> 
> 
>> On 23 Aug 2014 at 17:41, J Mcvey via ARC5 wrote:
>> 
>> I ran out of receiver knobs, so now I have to improvise. Someone here posted a
>> you tube link that described how to use what looked like a compression fitting
>> and some tubing to interface with the spline. I can see how the copper tubing
>> can be expanded, perhaps with a large torx bit, but the shaft is sloppy in the
>> fitting. I guess I'll have to devise a bushing? I did want to take a look at
>> that video again, since it seemed to work very well .Why re-invent the wheel?
> 
> That was I. What it requires is 1/4" BRASS tubing, not copper.
> 
> Cut a chunk off about 7/8" long. Then using a Dremel tool with one of those 
> really skinny cutoff wheels in it, or a very fine bladed hack-saw, cut two slots, 
> about 1/4" long, centered and opposite one another in one end of the brass 
> tubing.
> 
> Attach a GOOD knob (one with a brass insert and at least one good 
> set-screw (grub-screw, to our UK friends)) to the un-slotted end, then placing 
> the slotted end carefully over the spline, tap it over the spline fairly 
> vigorously, but not hard enough to mark the knob.
> 
> The brass is springy, and will expand a slight bit. It will be very tight on the 
> spline. You may have to "center it up" a bit.
> 
> There will be zero backlash with this.
> 
> If you're really anal about it, you could fill the slotted end with some 
> superglue before tapping it onto the spline...but you'd better be quick.
> 
> I have not found it necessary to glue or solder the brass onto the spline. It is 
> somewhat difficult to remove without bending it.
> 
> Ken W7EKB
> 
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