Using keder rail

I am going to try to use the keder rail on my camper to secure my TV mast to the camper while camped.  I am curious what people do with the black plastic piece that comes in the rail.  Do you pull the whole thing out and leave it out?  Or so you just cut and remove the part where you need access?  Are there any issues with leaving it out?
2014 Ram 2500
2019 [email protected] 400 Boondock


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