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Wouldn't mind getting myself a copy of your book actually 
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I can't off the top of my head visualise the DeVere condenser head, so I can't think where you could slip diffusing material into the light path. It may be difficult to fit a sheet of acrylic (or similar) plastic in there. But anyway, as other posters have said, acrylic may diminish output too greatly.
I'd use a piece of diffusion gel - you can find it in the Rosco catalogue if you can't source it locally - it's calibrated in 'stops' according to diffusion density. I'd get a sheet of '1/4 stop' then double it up until I found a happy medium between diffusion and light loss. A 50cm square shouldn't cost more than £5(UK) and I guess you could tape it to the flat side of the bottom diffuser.
If you can't source it locally from a photo store either try a disco lighting hire shop or a video supplies wholesaler - there should be one in Melbourne to supply the TV industry there.
You could also try graphic arts 'trace' - just make sure it doesn't have any visible grain.
Regards
Jerry
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 Originally Posted by gamincurieux
Wouldn't mind getting myself a copy of your book actually
Just got mine yesterday. There is a frighteningly large amount of information. Highly recommended.
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Jerry got it right. I use Lee lighting gels because that's what the local rental house carries. Both Lee and Rosco diffusion gels are grainless and aberration free. What's more, unlike acrylic, they're designed to take the heat generated by a light source. Full stop white diffusion (Lee 216) is probably overkill. I use half-stop (Lee 250) and find that it gives me the same quality of light under my Durst condensers as the dichroic mixing box on my color enlargers. It's available in 18" x 24" sheets at any lighting supply or Calumet. For my Durst 138 I have a sheet cut to the same size as the glass in the carrier. Lay it right on top. Why someone would want to mess with uneven "cold light" heads is beyond me.
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Pardon me, I should have said 'tape it to the flat side of the bottom condenser'.
Sorry to have caused any confusion.
Jerry
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Originally Posted by gamincurieux
... You know, could be that the nice white photocrescenta lamp is diffuse enough anyway without having to go to all this bother. ...
Very true. No enlarger is 100% specular or 100% diffuse. A condenser is typically right in between the two.
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Originally Posted by frotog
... Why someone would want to mess with uneven "cold light" heads is beyond me.
I often wondered that myself.
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Hi, Paul,
Try Rosco diffusion filter(s). I use them for that purpose, and they they work very well. They are tough, heat resistant, and durable. Thing is, you need to choose the one that's right for you, as they make a great many. Some diffuse more evenly than others. I believe the one I use is half white diffusion. Rosco used to send out a sample pack of gel swatches on request, you could try them out under lamps first to judge their diffusion properties. When you decide on the one(s) you need, you can buy different size sheets, and they are very economical for this application. Good Luck, Mike.
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Originally Posted by clayne
Look at the dichro head. Do you see that it uses something called a mixing box?
Actually the mixing box is for mixing the colors, which usually always come in from one side. It also provides diffuse light, but you don't need a mixing box to get diffuse light falling on the negative.
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The Rosco diffusion filters sound like a good idea. Anyone with a condenser enlarger and a glass negative carrier should try that.
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