[Shop-talk] retapping a hole

[john]

Pat is correct .  It is a stud with a ball mount attached to the mirror (to 
allow swivel)  the other end is a 1/4-20 stud that
screws into the mirror base mount... Sooooo I have to re-thread the mount from 
1/4-28 to 1/4-20
 
j

 

----- Original Message -----
From: Pat Horne <patintexas at icloud.com>
To: Jack Brooks <JIBrooks at live.com>
Cc: john <jniolon at att.net>, shop-talk <shop-talk at autox.team.net>
Sent: 1/17/2023 8:29:26 PM
Subject: Re: [Shop-talk] retapping a hole


It isn’t just a bolt, but a stud in the back of the mirror- as I understand it.  


Peace,
Pat


Pat Horne  
We support Habitat for Humanity



On Jan 17, 2023, at 8:16 PM, Jack Brooks <JIBrooks at live.com> wrote:


 
I guess I am confused.  While I only use Home Depot hardware as a last resort, 
even they have ¼-28 bolts in a variety of heads and finishes.  Why work hard to 
make a ¼-20 fit, when ¼-28 hardware is available?

Jack
 
From: Shop-talk <shop-talk-bounces at autox.team.net> On Behalf Of john
Sent: Sunday, January 15, 2023 7:38 AM
To: shop-talk <shop-talk at autox.team.net>
Subject: [Shop-talk] retapping a hole
 
I have a mirror mount on my truck door that held a rear view mirror.  
Unfortunately the mirror decided it didn't want to stay with my truck.
So, I'm 
looking for a replacement. The mount is drilled and tapped for 
1/4"-28 threads and most of what I find is 1/4-20.  I'm wondering if I can
re-tap the metal over existing threads with a 1/4-20 thread and it will hold...or will I just make a mess of it and make it broke. The drill side for the
two thread sizes are within a 64th or so of being the same and the mount is 7/16" 
or so wide so I have some meat to play with...
 
suggestions?
 
john
 
<image001.jpg>
  
 
another option... drill completely thru mount and find a mirror with a stud 
long enough to pass thru completely
and secure with an acorn nut (or something)  at the back side of the mount
 
<image002.jpg>
 
another caveat... I don't want to remove the mounts from the door... involves removing windows and regulators
to get to the internal nuts.
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