The ornamental design for an assemblyintroducerattachment, as shown and described.
FIG. 1 is a front-right perspective view of an assembly introducer attachment of the present invention;
FIG. 2 is a front view of the assembly introducer attachment of the present invention;
FIG. 3 is a rear view of the assembly introducer attachment of the present invention;
FIG. 4 is a right side view of the assembly introducer attachment of the present invention;
FIG. 5 is a top view of the assembly introducer attachment of the present invention;
FIG. 6 is a bottom view of the assembly introducer attachment of the present invention; and,
FIG. 7 is a rear-left perspective view of the assembly introducer attachment of the present invention.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.