I'm just starting my first EL assembly, and the 1/4" mono plug I bought from Radio Shack doesn't fit inside the diffuser tube. I purchased my parts based on the Jedi Loreen tutorial, and I assumed the plug would go inside all three plastic blade parts (poly c, poly e, and poly p). But even with the housing off the plug, the plug is too wide to fit the diffuser. Can the diffuser and bushing be "stacked" above the plug with the poly c tube covering the whole thing, or do I need to find a plug with a smaller housing diameter?

Just for reference, the plug model is 274-1536 (Radio Shack brand).

Thanks for any help.