[Shop-talk] retapping a hole

[Bob Spidell]

https://www.boltdepot.com/Search.aspx?q=1%2f4+x+28+screw


On 1/15/2023 8:06 AM, Eric Russell wrote:
> I think tapping over the existing 1/4-28 will result in weak threads. 
> How about a Heli-Coil in 1/4-20?
>
> EjR
>
> On Sun, Jan 15, 2023 at 10:46 AM john <jniolon at att.net> wrote:
>
>     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
>     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
>     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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>
> -- 
> Eric Russell
> Mebane, NC
>
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