Assembled for the first time.  Everything fits.

Servo on the left has a 2:1 right angle drive for rotation, and the one on the right is there to drive the mirror retraction.

The blue servo is a genuine Tower Pro servo.  The genuine servo is significantly more accurate than the grey knockoff one on the right.  About 5x more accurate.  That right there almost killed this project before it started as doubling the rotation range means halving the accuracy.  With the grey one that accuracy would have been about 7-10 degrees.

I may still ditch the lock part of the luer lock.  On some of my nozzles it requires >360 degrees of rotation to engage which is kinda a problem as I only have 360 degrees of rotation available here.

Now to build the mirror arm..