greenfield releasing acorn die holders

[alcostich]

I've acquired a handful of acorn dies. Unfortunately I don't have releasing holder for them. Nor do I know very much about them.
I assume the holders come in various sizes for different acorns.

Could anyone offer some lessons on how to determine what size holders work with size dies and, perhaps, how to use them?

Thanks.

Alan

 

[BaronJ]

Hi Alan,

I've only ever seen these on automatic lathes for cutting small threads. A Coventry die box was often used for larger ones.