Harmonica echo bell made from old 1950's  brass fire brush cover
And another that would only fit a Johanne Schunk "Piccolo"
And another in copper.
Having collected two or three Hohner "Echophones" and played them, I liked the wah-wah effect but not the harps that came with them. I wanted to use my "lee Oskars"
instead, and any in that size range.
A look round the boot sales for suitable "horns" brought forth a few of the old 1950
vintage brass fire irons sets that have a brush with a brass cover. Two of these were purchased for an old song, (not on the harp!), and the most suitable one chosen.
Careful measurements were taken of the harp and cutting commenced!.
The cutting was done using a miniature rotary saw blade in a mini drill and finished with a fine modellers saw.
Lots of careful fileing and bending with different pliers gave me a working model. The lips of the hole are made to grip the harp when inserted from the inside. A wood wedge can be inserted inside the horn to make the harp secure.A lot of buffing a polishing gives a quite antique look to the instrument. It sounds good as well. Going to look for more brushes!!.
If you try one let me know!.
The following Echo Horn was small and the only one in the collection to fit is the "Piccolo"
I fitted the piccolo in a different way to the first. It slides in to the hole and drops onto two lips bent inwards.
Amazing the difference in sound quality this makes to this little harp!
The silver appearance in the first pic is due to tungsten lighting.
Wonder if I can find an old trumpet somewhere, or maybe a tuba??
Still, its an interesting sideline on the collecting bit.

March 19th 2006
Another one!.
This started life as a homemade copper jug.
Fits quite a range of harps. Fixing by means of a piece of Mahogany cut to fit inside.
Thinking of changing the end cap for a large old copper penny. Hope "Bullphone" aint registered.!
Copper penny was too small so I used a New Zealand half crown