The ornamental design for an open architecturecapassembly for drop tube rigid mount orbitor, as shown and described.
FIG. 1 is a top perspective view of an open architecture cap assembly for drop tube rigid mount orbitor according to the invention;
FIG. 2 is a side view thereof;
FIG. 3 is an opposite side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a rear view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The broken lines in the drawings show portions of the open architecture cap assembly for drop tube rigid mount orbitor that form no part of the claimed design.