[Mgs] Gear shift knob

[Barrie Robinson]

Folks,

Thanks for the many responses.   The difference between the knob and 
gear sift knob is very very small.  I do not want to drill it out 
because I might damage the wood (it is gorgeous - recommend all 
should get one - go look at the selection!).   Although the knob has 
a hard finish I do not think it will take kindly to a vice.  Perhaps 
I should make a sort of cup to hold it firm while I drill 
gently.  Another suggestion is to use a rubber sleeve and this has 
merit because I only need something like 1/64.  A sleeve would act as 
a vibration buffer - not that Astons have vibrations (-:.      So 
that is my first attempt, cup holder next............and go look at 
Larry Heap's knobs (alright, alright, settle down class!!!!)




At 11:05 PM 3/31/2010, Richard Ewald wrote:
>Heilcoils and other thread inserts don't go to the next standard thread size
>to the best of my knowledge.
>A helicoil kit comes with some bizarre sized tap that is set to the outside
>of the helicoil.  For example if you have a stripped 1/4X20 hole, it does
>not tap out to 5/16X18 or 5/16X24 because the threads per inch have to
>remain constant between the desired size and what it is being tapped out to
>for the helicoil.  So if you are installing a helicoil in a 1/4X20 hole
>whatever the size the tap is it will be 20 TPI.
>So if your knob is larger than the shift lever, you can have a custom insert
>machined assuming the difference is large enough, or you might be able to
>fill the hole with some type of filler that can then be drilled and machined
>(JB Weld?) or you can buy a new knob.
>Rick
>
>On Wed, Mar 31, 2010 at 2:13 PM, Max Heim <max_heim at sbcglobal.net> wrote:
>
> > Are you thinking of Helicoils?
> >
> > It will probably require drilling and retapping the knob, to the next
> > larger
> > SAE thread.
> >
> > --
> >
> > Max Heim
> > '66 MGB GHN3L76149
> > If you're near Mountain View, CA,
> > it's the primer red one with chrome wires
> >
> >
> > on 3/31/10 1:00 PM, Barrie Robinson at barrie at look.ca wrote:
> >
> > > I got a beautiful gear shift knob from Larry Heaps who can be found
> > > on www.britcot.com - it was for my under restoration Aston.   But, as
> > > usual, Brit threads are different and it will not fit.     The gear
> > > shift thread is 5/16 with 22 pitch, the knob is slightly larger than
> > > 5/16 with bigger thread.  There are some inserts one can get but I am
> > > damned if I can remember the name and what they do.  Can someone help
> > > here please? - Thanks in advance for responses.
> > >
> > > I tried plumbers tape and that was hopeless.
> > >
> > > Regards
> > >
> > > Barrie
> > > barrie at look.ca
> > > (705) 721-9060
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Regards

Barrie
(705) 721-9060