Dave asked about the correct height of the crank on a mechanical organ.
Or course, there is no correct height; it depends on the stature of the
person who will be cranking the organ.  And it is _much_ more important
than whether the organ appears an inch or two too tall.  Measure it
somewhat like measuring the height of a bicycle.

As a starting point, stand with your elbow near the pivot of the
handle.  Raise or lower the organ until the pivot of the crank is just
below your elbow.  Then stand (casually upright) behind the organ and
move to the left enough to have the handle clear your body as you turn
the crank.  That will be when the crank is at about the 8 or 9 o'clock
position, viewed from the back of the organ where you are standing.

Now, move the handle to the 4 or 5 o'clock position (not straight
down), where the handle is farthest from your shoulder with your arm
straight.  (Actually, your arm should be slightly bent at a comfortable
angle, maybe 25 degrees.)  Arranged in this way, the handle should fall
between the palm and thumb of your hand if you close your fingers
around it.

Try it, you'll like it.  Believe me, if you have it a couple of inches
too high or too low, your back and arm will soon regret it.

Craig Smith