Henry Seymour Attachment/Horn for Edison Gem Question

[phonohound]

Greetings;

I have a Henry Seymour Diaphragm that fits an Edison Gem. The opening where the horn fits is too large for a standard size horn. Does anyone know what type of horn should fit? I have seen an advertisement that mentions Seymour horns at 20+ inches in length.

Does anyone have an actual Seymour horn or know of how to configure such a set-up?

http://webpages.charter.net/phonographs ... phragm.jpg
Here is a pic of the attachment.

Thank you for any information.

[chunnybh]

Can't say I have ever seen one but here are a few ads.