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It seems that there ought to be some size of hose reel that might work. I have seen guys who make a plywood sandwich that they set the roll on and then insets some sort of bolt and nuts to keep it together. Then they roll off wire instead of pulling it off the center.
I wonder if one of the orange cord reels might be able to be taken apart and put back together to hold your wire on.
Mark, I don't personally do much wiring but I've watched my electrician's guys working for years. They usually have a 1,000ft roll or larger that they bring into the building without wrapper and put it down on the floor. Then they start pulling wire off of it. It never seems to become entangled or disorderly. And by the end of the day they've used all or most of it.
I've worked out of the wrapper myself with small rolls, you can put a wrap of packing clear tape on the outside circumference to strengthen it. But it's usually strong enough, a 100ft roll doesn't need to last very long.