Generic points on cylinders

This is the syntax you would need...

CYL1       =FEAT/CONTACT/CYLINDER/ADAPTIVE_CYLINDER_CONCENTRIC_CIRCLE_SCAN,CARTESIAN,IN,LEAST_SQR
            THEO/<6.6062,-2.9925,1.4>,<1,0,0>,0.1967,0.8312
            ACTL/<6.6062,-2.9925,1.4>,<1,0,0>,0.1967,0.8312
            TARG/<6.6062,-2.9925,1.4>,<1,0,0>
            START ANG=0,END ANG=360
            ANGLE VEC=<0,0,-1>
            DIRECTION=CCW
            SHOW FEATURE PARAMETERS=NO
            SHOW CONTACT PARAMETERS=NO
            DATDEF/F,FEATURES=CYL1,,
PNT_START  =GENERIC/POINT,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<CYL1.TSX,CYL1.TSY,CYL1.TSZ>,$
            MEAS/XYZ,<CYL1.SX,CYL1.SY,CYL1.SZ>,$
            NOM/IJK,<CYL1.TI,CYL1.TJ,CYL1.TK>,$
            MEAS/IJK,<CYL1.I,CYL1.J,CYL1.K>
PNT_END    =GENERIC/POINT,DEPENDENT,CARTESIAN,$
            NOM/XYZ,<CYL1.TEX,CYL1.TEY,CYL1.TEZ>,$
            MEAS/XYZ,<CYL1.EX,CYL1.EY,CYL1.EZ>,$
            NOM/IJK,<CYL1.TI,CYL1.TJ,CYL1.TK>,$
            MEAS/IJK,<CYL1.I,CYL1.J,CYL1.K>
LIN1       =FEAT/LINE,CARTESIAN,UNBOUNDED,NO
            THEO/<6.6062,-2.9925,1.4>,<-1,0,0>
            ACTL/<6.6062,-2.9925,1.4>,<-1,0,0>
            CONSTR/LINE,BF,3D,PNT_START,PNT_END,,
            OUTLIER_REMOVAL/OFF,3
            FILTER/OFF,WAVELENGTH=0

TSX, TSY & TSZ are the theoretical start coordinates and SX, SY & SZ are the measured.  Similarly, TEX, TEY & TEZ are the theoretical end co-ordinates and EX, EY, EZ are the measured.  Once you've created your two generic points and populated all of the fields with the appropriate syntax, you can construct your line.

My only question is, why go to all the trouble when you can just use the cylinder in your alignment and get the same behaviour?

A thread that I read on this forum suggested creating these points and using them to combine two cylinders. It was said it is the best way to alleviate form error. I have graphite parts in which we grow metal onto and later dissolve. The parts are very small and I am trying to achieve the most accurate center for these parts.  I have been questioning my results and experimenting with other alignments to see if the results vary.  I appreciate any help or suggestions, 

A thread that I read on this forum suggested creating these points and using them to combine two cylinders. It was said it is the best way to alleviate form error. I have graphite parts in which we grow metal onto and later dissolve. The parts are very small and I am trying to achieve the most accurate center for these parts.  I have been questioning my results and experimenting with other alignments to see if the results vary.  I appreciate any help or suggestions,