[Healeys] BN2 screw in the center of the dash

[Bob Spidell]

Thanks for the correction, Curt. I'd always wondered why 'posidrive' 
screws were used--I think posidrive is a relatively recent 
development--and why regular phillips drivers worked in them (I think 
posidrive has a steeper angle of the screw blades). I have a posidrive 
screwdriver, but I usually grabbed whatever was handy. Do you know of a 
source for the correctly marked screws?

Do you know if the backing flat washer was tapped (I don't think so, but 
I'm not sure). IIRC there is a tapped plate that binds the 
screws--again, chromed--that attach the rearview mirror.

Bob


On 3/22/2021 7:59 AM, Curtis Arndt wrote:
> Hi Bob and Joe,
>
> Just a quick correction, "Pozidriv " screws were never used on AH 
> 100s, BN1/2s.
>
> The four marks on the head of these 10-32 screws were there to denote 
> UNF from "Whitworth" during the changeover to the Unified screw thread 
> forms in the 1950s.
>
> I've attached a page from my vintage Machinery's Handbook which 
> illustrates this fact.
>
> Cheers,
>
> Curt
>
> On Sun, Mar 21, 2021 at 11:27 PM Bob Spidell <bspidell at comcast.net 
> <mailto:bspidell at comcast.net>> wrote:
>
>     I neglected to mention the screw is backed-up with a large, extra
>     thick flat washer (because of the large hole in the bracket). It's
>     unique because it's as thick as a couple of typical flat washers
>     and /might--/I don't recall for sure--be tapped for the screw.
>
>     On 3/21/2021 10:21 PM, Bob Spidell wrote:
>>     Yep. And, the original screw is chromed posidriv, with a slightly
>>     oversized--the screw is a #10 IIRC--chrome washer. I noted this
>>     when we tore down our BN2 for restoration, and promised myself
>>     I'd not lose these. I lost them (and have never found proper
>>     replacements).
>>
>>     You can sorta see them in this grainy photo (I /shoulda/ took more).
>>
>>     Bob
>>
>>     On 3/21/2021 4:14 PM, Joseph Costa wrote:
>>>     Does it just attach to the brace behind the dash?
>>>
>>>     Joe
>>>     BN1 #923
>>>     BN2 100M
>>>     BJ8 Blue Baby
>>>
>>
>>
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