Lee Universal has a die body with a separate rod with a pin on the end of the rod. Don't think you can interchange the pin with, lets say, an RCBS pin, because it appears the Lee pin is secured in the end of the rod (at least I couldn't figure out a way to do this with my spare RCBS pins).
The Lee rod is secured in the die with a collet type arrangement, which is designed to allow the rod to slide if too much pressure is placed on the pin. Works out that way sometimes.
I decap first because I tumble with stainless steel pins.
A lack of planning on your part does not necessarily constitute an emergency on my part.