With the junction box. I pick the pellets out, the duct seal itself lasts, doesn't seem to ever harden. Grab a beer (or several), some skinny long-nose pliers, and have at it...it doesn't take long for .22, slower for .177...
With the junction box, I attached the cover plate using the top 2 screws so it sticks up above. I use two of the super-spring-clamp-magnet-things to hold my targets, they grip on that cover plate, allow me to move the target around (I like the ones with 5 targets, or with a whole bunch of little circles for the rifles).
I also stick tin cans and other things that need to be destroyed on the duct seal, works great for holding stuff in place.
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