I have finished all the drilling, and built the control arm to the correct length to control my trim tab with the Ray Allen servo. This necessitated figuring out the in and out wiring, and measuring distances on the servo actuator arm to make sure I got it just in the middle for installation. A 9V battery runs in in and out. I recorded the polarity for both on the data sheet. Ready for inspection to make sure I didn't miss something, then disassembly and deburring.