The difflock mechanism in the Felt IA is actually quite simple to adjust to get the saddle level. However, it is not conventional so getting the angle that you need may not seem obvious at first.
You can use the Compass setting on your smart phone which has an angle finder if you swipe to the right. Place a book or clipboard or some flat surface on your saddle. Then using the edge of your phone as the angle finder check the current position.
The mechanism itself has two means for Angle adjustment one larger ring which provides 9.5° of adjustment per spline and the smaller inner surface at the caps threaten to which offers 10° of adjustment per spline.
By rotating the inner and outer splines one "tooth" in opposite directions you get 0.5° of adjustment. This amount is so small it is in perceptible to the human eye and even your digital phone cannot detect .5° increments.
So if you need to make a 3° adjustment, for example. You need to rotate the inner spline with 10° of adjustment six notches or teeth in the direction you want the saddle to move. This will shift the angle 60 degrees. Next you'll need to move the outer spline with 9.5° of adjustment in the opposite rotational direction six notches as well. 6 × 9.5 equals 57°
The difference in rotation will provide the 3° movement that you needed in my example.
This can be illustrated much easier than I can be explained on a slow twitch post, feel free to call me if you'd like me to walk you through the process when you have the parts in hand.
When reattaching the outer saddle clamps be sure you tighten them alternating between left and right making sure you have equal thread engagement. If you tighten one side completely then try to tighten the other side to torque properly there will not be enough thread engagement.
SD
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