Be sure to not forget to thread the end cap on the wire before threading the power wires through the gland.

Test the fit in the device. You may have to sand the plastic gland a bit to get that perfect fit.

I had to sand down the end cap (shorten it a bit) to get the end cap to tuck into the iron and really tighten on the wiring. The photo shows the end cap before being shortened.

I used a dremel tool to grind down the cap.