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

[J Mcvey via ARC5]

OK, but where does one find 1/4 brass tubing? What is it used for commercially? Old style brass toilet feeder tubes are 3/8" . I looked at the local hardware store and also Home Depot, but no luck. Would it be found in an auto parts store?



On Saturday, August 23, 2014 9:33 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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