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<div> <font size="3">You could retap it for 1/4-20 and use some loctite (R) thread locker to compensate for the feeble threads that result.</font><font size="3"> Or just drill it clear and epoxy it in.</font><font size="3"> Of course there's no turning back at that point.</font><br>
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<div><font size="4">Dave <br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font size="2">-----Original Message-----<br>
From: john <jniolon@att.net><br>
To: shop-talk <shop-talk@autox.team.net><br>
Sent: Sun, Jan 15, 2023 9:37 am<br>
Subject: [Shop-talk] retapping a hole<br>
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<div><font face="Segoe UI">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.</font></div>
<div><font face="Segoe UI">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</font></div>
<div><font face="Segoe UI">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</font></div>
<div><font face="Segoe UI">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...</font></div>
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<div><font face="Segoe UI">suggestions?</font></div>
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<div><font face="Segoe UI">john</font></div>
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<div><img style="min-height:570px;WIDTH:858px;" alt="" src="cid:MefOfCHxAWuDacZj3iPY" yahoo_partid="1.2" width="1499" hspace="0" height="1086" border="0" align="bottom"> </div>
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<div><font face="Segoe UI">another option... drill completely thru mount and find a mirror with a stud long enough to pass thru completely</font></div>
<div><font face="Segoe UI">and secure with an acorn nut (or something) at the back side of the mount</font></div>
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<div><img style="min-height:453px;WIDTH:622px;" alt="" src="cid:p5cTtWhkAtjhJbebw0Wc" yahoo_partid="1.3" width="460" hspace="0" height="364" border="0" align="bottom"></div>
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<div><font face="Segoe UI">another caveat... I don't want to remove the mounts from the door... involves removing windows and regulators</font></div>
<div><font face="Segoe UI">to get to the internal nuts.</font></div>
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