Buy a chalk line reel like this
DEWALT 100 ft. Chalk Reel DWHT47372 - The Home Depot then cut off half the string and replace with thin wire. I use a bowline knot on both the wire and string and you may have to drill out the rivet where the string comes out and maybe remove the internal felt string gripper.
Since I use mine for transmitting as a 40m EFHW I completely replace everything using 64ft of 22ga Teflon wire and about 40ft of sub miniature para cord that is the same dia as the wire. The string is internally attached to the reel so when you pull out the wire then the string the reel housing becomes your throw weight.
This particular chalk line reel has a two or three to one gear ratio making windup very fast. You can deploy it in minute and wind it up faster. Here are a couple of older chalk line reels I modified and one is a complete tuned 40-10m EFHW good for 100w SSB.