To make the plates for strake B, we preselected 'lonseam1' and 'lonseam2', then File/ Component/ Loaded the strakesplates component. The component can be edited in its new location, and we moved one of the rings on 'lonseam2' forward so the butt seam would be sure to clear the frame next to it.
For the plates for strake C, we repeated the procedure.