The Lundahl 2911 transformer runs about $70.

Notes

• I was able to pry apart the grills with a little effort,  perhaps a hook or very small screwdriver would do the trick. they're just held in by two metal tabs and tension.
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• It's really straightforward the stock transfomer is held in the metal caninster which screws over the XLR mount.  Two wires to the motors and two to the XLR Plug.
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• Issues - In theory loosening the side screw on the Mount should loosen the assembly for removal  - this loosened it, but mine seems to operration on just a minute amount of tension and the XLR assembly aint coming out.  So soldering the leads into the Pins is pretty delicate.
• Also of note, there are two  unused  threads, which would work pefectly for mounting a small assembly to mount a transformer if the cannister is not preferred. Print your own and use the 2912 PC mount version.
  

Tools:

• Soldering Iron,
• Screwdriver

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