Same/similar to Blackdog. I'm using freetrack and single point.
Basically, create a custom profile for the 109 with a custom center. Once you create this profile, your done. No need to use Shift-F1 ever again for the 109.
To create custom center in Freetrack, you map key to custom center "set" function (e.g., space key) on the controls tab. Now start up the game, sit in 109 at dead center (pitch/yaw/roll/x,y,z=0) and move your head to the right along the X lateral axis until the sight is centered on the glass. Press the spacebar key (tip, it might be easier to turn off some uneeded axis like roll/z when you do this so you can get it lined up good when you press the space bar key.). Okay, now go back to controls tab and un-map that spacebar key. This to prevent losing your custom center in the future. Now save the profile and use it whenever you fly the 109. The parameters are listed in that custom profile and look like this:
[CustomCenter]
Yaw=
Pitch=
Roll=
X=
Y=
Z=
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