Until the struts are properly set, you will be realigning the beseler enlarger everytime you change the height of the head. In reading this thread again it's apparent that this is underappreciated if not totally misunderstood so much so I now suspect that 99% of the alignment problems that vex beseler mx owners could be traced back to this misunderstanding. Instead of clamoring about alignment tools and adjustable lens boards this dorky debate should really be about the relative merits and shortcomings of a protractor vs. an angle finder.
Originally Posted by EHM2
The Versalab is a convenient albeit pricey tool to measure the parallelism of the three planes. But the degree of accuracy it provides is really only necessary to printers who need or who prefer to expose with their lenses wide open and who are using glass carriers. A piece of safety glass and a bubble level will suffice for instances of enlargement under 20x or for folks who prefer to stop down a stop or more.
In the case of the 150mm apo componon f4, parallelism at the lens stage is accomplished by adjusting the three spring-loaded thumb-screws that retain the lens stage plate to the camera. These adjustments should only be in the order of fractions of a millimeter. If you find that you need more adjustment at the lens stage then you have something set up incorrectly.