Has anybody got any comments on the servo arms to be used? There is no mention of it in the manual and the ones in the pictures seem to be DuBro HD.

I installed intially the 1.5' H9 machined arms, which are very tight. They do however look too large and so far off to the side that the linkage to the hardpoint might get a bit offset and diagonal.

Instead of measuring a direct line from the servo side as per the manual (which hits the middle of the hard point), the line from the arm external hole goes to the outside edge of the hardpoint. If I want to drill in the middle, I will have a linkage that is not at 90 degrees to the servo.