Paul, I got the laser installed today.  In the picture notice the red
dot on the "firewall".  This is the cross hair of the vertical and
horizontal thrust lines. The laser passes through a three inch long .
250 i.d. nozzle to assure proper alignment.  So far this is working
out.   I am still hoping that if the engine needs to be moved off
straight ahead thrust, we can use the laser. The prop flange is just
a point in space that I doubt I could determine accurately.  There is
the possibility that a light weight extension on the laser bracket
could be used to simulate the prop flange. LOTS of opportunity to
screw up here.      Jerry

Jerry,
Wouldn't it be better to shoot a laser through an (old) drilled  through
eccentric shaft ( in the motor). You could set the laser the desired
distance (variable prop flange distance) from the firewall - no  chance of
screw-up then!
George ( down under)

Hi George,  I did spend a lot of time making sure the laser fired
straight  down the thrust line, but now that I have it done, I don't
see any problems or need for further accuracy.  It is much more
precise than the fixtures I have been working with for years. In the
24 hours since I wrote the line about lots of opportunity for a screw
up, the whole fixture has come together beautifully and I am pretty
happy with the result.   Jerry


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