Wow, I just took apart the old HM 4000 gyro that came with the heli to look for this second trim pot and thats just what I found. Since I had the case open I cut out the covering from the inside out and put everything back together. Then I memorized the position of were the pot originaly sat, hooked everything up and tried it out. WALA, subtrim is know at 0 and the arm holds when switching between HH and Rate.

Then I turned my attentions to the AXE, I cut out the hole position to match the old gyro and turnded everythingon. Then I set my radio back to 0 subtrim and used the newly found trim pot on the radio to set the HH to match the Rate position. It only took about 1/16th of a turn to get it just right. Know I actually get the same amount of left throw as Right because subtrim isnt being used in the radio.

Truly thankful you posted your find Jason 3-Danhakl, I cant wait for the weather to get better to try it out.