Depends upon what you are doing. If you are spacing the two elements then
such a thing is a good start for the collimation. However, the end of the
tube isn't necessarily square with the optical axis of the optics so you
need to check and adjust if necessary the optics themselves. The
reflections of light from the various element surfaces is generally the
right way for a lens to get the surfaces coaxial to the tube.

--
Bob May
Losing weight is easy! If you ever want to lose weight, eat and drink less.
Works every time it is tried!