Hi all!
Thanks for the excellent info here - mod pictures, milliamp measurements et.c..!
Thought I might just add my mod picture too. I found a really tiny (like 10.000 times smaller that jmod757's beast! :D ) switch regulator board, that still does 1.5 A. Only have a Swedish link for it:
https://www.electrokit.com/produkt/switchregulator-step-down-0-8v-17v/
The board was small and light enough to "float in the air", being connected by some old resistor pins directly to the DC jack. (I was worried that tape/glue might come loose inside the box after some time..)
I can't say the mod was very difficult - but if you have never soldered in your life, I would probably stay away from it.
Regards,
Lars Lengberg