geps

The polarity should be indicated on every DC input. If you need to change polarity you have to buy cheap adapters you can easily find on Amazon or other store. Maybe only two 500mA could be insufficient, I preferred use the 1.2V trick with the PWT 12.

Well I bought a Palmer PWT MKII as suggested by nick83ola: and I must say it works very well. You can see here my pedalboard finally completed: every pedal is powered by the Palmer; for the HX Stomp I used four 9V/300mA out.

I like this hack very much! 1200 mA shoul be enough for thirsty stomp! How did you connect the pedal chain to the HX? Did you make the adapter by yourself or find it in some shop?