[Milsurplus] IN-121 Insulator wanted

[WA5CAB at cs.com]

Dave,

I sold all that I had acquired over the years to a guy doing a USMC SCR-608 
installation (Jeep).  Very early IN-121's (maybe it was a prototype, but I 
saw one somewhere years ago) were machined out of linen or canvas-based 
phonolic.  I made a set for a Weasel SCR-694-C installation last Summer.

IN-121 is a flanged tube.  

LOA                        1-1/8"
Flange OD               1-1/2"
Flange Thickness     1/4"
Tube OD                  1"
Tube ID                    7/16"
Grooves                   4 about 1/16" R semicurcular equally spaced 
Color                       Dark Brown
Hitch Clip                 McMaster 98395A229

I would in your case do what I did for the Weasel and cut only the groove 
that you actually need.  In the Weasel, the insulators were actually mounted 
with modified P-clips.  I didn't record the part number but I bought a foot 
of 1-1/2" dia. phenolic from McMaster.  Likewise, the round nose grooving 
cutter came from McMaster.


In a message dated 06/22/2012 10:28:52 AM Central Daylight Time, 
davprin1 at optusnet.com.au writes: 
> G'day all,
> 
> Looking for an IN-121 insulator. It's a hollow ceramic 
> insulator that fits into a hole (in sheel metal vehicle 
> body) and allows a cable to pass through.
> 
> Alternatively, if someone could give me the dimensions, I am 
> sure we could make a facimile.
> 
> Cheers
> Dave
> VK4KDP

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480