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Only Acoustic Measurements of the pictured setup ( that capture the offsets ) would be able to answer your question ( so that leaves me unable to help ).

Sorry :)

Here's a pic showing these horn in action ( within an un-named studio ).

http://techtalk.parts-express.com/filedata/fetch?photoid=1364559


:)

Well, we all need a "shop nanny".

I'm thinking that metal cutting fluid is a necessity .

I have yet to try this out ( I may using the neighbours drill press & my hole-saw & some cutting...

All good points Tim! I had forgotten that I didn't have easy access to a drill press (back then in 86), hence the punch usage .

Louped, here's the promised picture ( better late than never, I...

You're Welcome Louped !

I'll take another picture of the stock plate and post it here.

I had received a stock adapter ( way back when in 86 ).

I simply made the rest out of 1/8" hardened...

Yep, I'm quite familiar with those NorthWest Horns ( owning more than 2 dozen of them ).

If they are @ 24" across then they are the Model 340 ( meant for drivers with a 2" exit ) . There was also...