> On 19 Jul 2021, at 00:39, John Dammeyer <jo...@autoartisans.com> wrote:
> 
> case though is there a way to limit the distance the butterfly turns?

Have you considered a disc spring setup instead?  The one on my mill has worked 
well. 

Otherwise: maybe you could have a plain section above the thread for the nut to 
run in to, and then a cap to stop it all disassembling. 
You might want a spring to re-engage the nut with the thread. 





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