This is a random video example of the double nut.  She does a pretty good job.

https://youtu.be/HRHWF6JWqko?si=-iCkHyuGNaktHnpZ

For particularly difficult studs where the nut have difficulty locking together 
sufficiently to not spin you can us flanged lock nuts pictured in the link 
below.  The flanges kind of ratchet-lock against one another when installed 
flange to flange.

https://www.tapcoinc.com/images/uploads/92/large_flange_serrated_lock_nut__hero.png

Jun 23, 2025 08:27:17 Dennis C. via CnC-List <cnc-list@cnc-list.com>:

> The most common method of removing studs is to double nut it.  That is, screw 
> a nut down on the exposed threads then screw a second nut down on top of the 
> first.  Use two wrenches to tighten the nuts together.  Then use a wrench on 
> the first nut to try to loosen the stud.  In theory, the second nut will keep 
> the first from loosening and allow it to turn the stud.
> 
> --
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
> 
> On Mon, Jun 23, 2025 at 6:57 AM David Knecht via CnC-List 
> <cnc-list@cnc-list.com> wrote:
>> Hi Douglas- I thought about replacing the studs as one is likely thread 
>> damaged, but I have no idea how to do that.  They are supposed to be 
>> threaded into the manifold.  Any suggestions?  Dave
>> 
>> David Knecht
>> 
> 
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