Okay, now I finished the electronics (soldering the last bits was a pain... but w/e) and I would like to finally mod these servos.
I am using the 9V battery combo with the 4xAA battery holder. I set up the circuit the exact same way as the .pdf schematic found in this .zip file posted in the tutorial: http://www.societyofrobots.com/robotforum/index.php?action=dlattach;topic=3292.0;attach=1304
1) 9V (+) connected to 5V regulator lead (farthest from microcontroller)
2) 9V (-) connected to 5V regulator middle lead
3) 4xAA battery holder (+) servobus
4) 4xAA battery holder (-) grounding wires
So I plugged in my first servo into the servo bus (black,red,yellow; black being the farthest from MCU), and plugged in my AVRISPmk2 into its header location (red stripe closest to ceramic capacitor). I opened up AVR Studio 4.0, clicked on the AVR black IC icon, went to the FLASH .hex programing option, found the centering .hex file given in the servo modding tutorial, and then hit program.
The result was that everything read "OK!" on the programmer. Both green lights were on the programmer, but no servo movement. So I checked out some readings with my voltmeter. I accidentally shorted the transistors middle lead and the 9V (+) connected lead for a short second and noticed that the servo moved. So, I kept on trying to short it and the smaller light on the programmer would occasionally go red or green depending on if the leads were shorted. If I held them shorted for more than a second it would usually just briefly move, but no continous rotation. So, right now I am absolutely lost with what to fix or look for. Any ideas?
Sorry for the long post but after spending ages soldering, I was hoping this would work out