[Shop-talk] retapping a hole

[Jack Brooks]

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

[cid:image001.jpg at 01D92A9D.146648E0]

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

[cid:image002.jpg at 01D92A9D.146648E0]

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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