[Hallicrafters] knob retaining screws

[Douglas]

They arrived. Highly recommended. I was expecting a
larger package, no matter they're exactly what was
needed. I'll have to keep an eye on them just in case
they decide to grow legs.

Douglas


--- rbethman <rbethman at comcast.net> wrote:

> Well, there I go - learning again!
> 
> *I* have not run across the four spline knobs YET!
> 
> But I like Roy's solution!
> 
> Bob - N0DGN
> 
> Roy Morgan wrote:
> > At 12:37 PM 10/4/2007, you wrote:
> >> ... set/grub screws holding knobs on
> >> that are not allen or slotted screw, they seem to
> be 4
> >> sided. What type are they
> >
> > Douglas,
> >
> > They are four-slot BRISTOL spline set screws.  I
> am working on an 
> > SX-88 which uses:
> >
> > the six-flute .096 inch spline screws in:
> >  - the band switch shaft couplings
> >  - the band switch knob
> >
> > and four-flute smaller diameter spline set screws
> in most other places 
> > (Including the gearbox, which I have completely
> dis-assembled.)
> >
> > The place to get *genuine* Bristol Wrench Company
> USA produced, 
> > highest quality tools is at Max Gain Systems.  I
> recently got long 
> > L-wrenches in three sizes for about $2 each.   If
> you call now, they 
> > would be in the mail to you tomorrow, or maybe
> today:
> >
> > Max-Gain Systems:
> > http://www.mgs4u.com/Bristol-spline-L-keys.htm
> > 221 Greencrest Ct., Marietta, GA 30068-3825
> > Phone: (770) 973-6251
> > Fax: (815) 461-7730
> > Email: <mailto:info at mgs4u.com>info at mgs4u.com
> >
> > These folks have straight wrenches chucked in
> screwdriver handles, one 
> > for each size, short arm and long arm individual
> wrenches, and kits.  
> > Their SS-508 kit is likely to do all you need, and
> is priced at $14 
> > plus $2 sh.
> >
> > They have a special to get a very nice allen
> wrench kit in addition 
> > for a modest amount more. "Special combination
> price! The HS-206 if 
> > purchased WITH the SS-508 Bristol spline L-key kit
> are priced at 
> > $18.95 plus $3 shipping in US and possessions, $4
> worldwide. Ask for 
> > the "HS-206 combo". "
> >
> > There are two sizes of 4-flute set screws you may
> have run into:
> > S-069-4, or S-076-4
> > The three digits in the middle are the size in
> thousandths of the 
> > outer diameter of the wrench:  I suspect it is the
> S-076-4 that you 
> > need.  If you intend to order only the minimum to
> get you covered, 
> > discover the size of an allen wrench that seems
> like it should fit.  
> > (Note that allen wrenches are sized from flat to
> flat, not max outer 
> > diameter.)
> >
> > R-390 receivers use the 6-flute .096 size.
> > HP instruments with very small knobs use the
> smaller or smallest 
> > 4-flute size.
> >
> > I have three suggestions:
> >
> > 1) Do not order from Snap-On. You'll pay as much
> for one wrench as you 
> > do for all you need from Max-Gain.  Do not go down
> to Sears or any 
> > other place looking for these - they don't have
> them.
> > 2) order from Max-Gain and get the best available
> > 3) break the sharpness of the end of the wrench
> with a very fine 
> > sharpening stone to make it easier to get it into
> the set screw
> >
> >
> > The Xcelite 99-series wrench inserts with handles
> (Tee and screwdriver 
> > type) are very good also.  They make a kit with
> handle, extension, and 
> > nine wrench inserts.  Mouser lists these inserts
> as individual parts 
> > but most of them are described as "discontinued". 
> The Xcelite tools 
> > are not discontinued by Xcelite, or their
> distributor which is:
> >
> > Cooper Tools apparently supplies Xcelite sets to
> retailers:
> > Cooper Tools, Inc (Xcelite):
> >
>
http://www.cooperhandtools.com/brands/xcelite/index.cfm
> >
> > Another source is:
> > Newman Tools, Inc.:
> > http://www.newmantools.com/hand/splinekey.htm
> >
> > Call Max-Gain now.
> 
> 



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