Thanks for sending that Earl, but I think you are giving Jim a bum steer.
I have a 4-40 NC tap and it will not go near the original thread in the
lock that I have. I'm pretty sure that if I gave it a bit of a push I could
run the tap through the zinc die-cast but it would have to remove quite a
bit of metal.
The screw I have appears to be original, it has a raised countersink slot
head and is actually chromed!!!
When I put a 40 TPI thread gauge on the screw it does not match at all but
a 56 almost settles in as does a 64...
I don't have a 60...
Of course Jim will have to be very careful about this as it probably good
for many concours points ;-)
Michael S
BN1#174
On Sat, Dec 28, 2013 at 12:57 PM, Earl Kagna <kags@shaw.ca> wrote:
> Gentlemen:
>
> Below is a copy of my reply to Healeyman Jim a couple of days ago - should
> have copied the List as well, but didn't:
>
> Jim:
>
> It's 4 - 40. I had to find / make a new one for my glove box lock earlier
> this year. Hard to find - I wound up buying a small pack of 6 (I think) at
> a hobby supply store -they were socket head, and I had to mess around with
> it to get it right. The original was probably 1/8" long, I ground mine
> down
> so it would not protrude beyond the wall of the cylinder case and foul the
> lock barrels rotation. Picky crap, but it all worked well in the end.
>
> It's possible that someone before me had modified the threads for the
> screw, but I doubt it. (I've owned the car for 33 years). The 4 - 40 screw
> worked perfectly, so I assumed that it was the original thread size.
>
> Michael, you might check your existing sample with a handy 4 - 40 screw
> and settle the argument - I for one would like to know, since I wouldn't
> want to have given Healeyman Jim a bum steer!
>
> Earl Kagna
> Victoria, B.C.
> BJ8, BT7 tri-carb
>
>
>
> ----Original Message----- From: Michael Salter
> Sent: Saturday, December 28, 2013 9:14 AM
> To: healeymanjim@hansencc.net
> Cc: healeys@autox.team.net
> Subject: Re: [Healeys] set screw
>
>
> Hi Jim,
> As far as I can tell it is an 8BA thread. The OD of the one I have is
> 0.083" and it looks like around 58 TPI, bit hard to measure without a
> comparator.
> 8 BA is 0.0866 OD and 59.1 TPI
> Unfortunately the smallest BA tap I have is 6 BA so I cannot check the
> female thread for you.
> 1/16 and 52 British Cycle threads are also close but I would bet on the 8BA
> as it is the closest.
>
> Michael S
> BN1 #174
>
> BTW I have a complete BJ8 glove box c/w key that I will sell for 50% of the
> MM price.
>
>
> On Wed, Dec 25, 2013 at 10:00 PM, <healeymanjim@hansencc.net> wrote:
>
> what is the size of the set screw that holds the cylinder in the glove box
>> lock? TIA hjim
>>
>
>
--
Michael Salter
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