Anyone who has laid out 100 ft or more of string line knows what a pain it is to wind it back up on those stupid plastic holders.
So I made one with a retractable handle that you can use a drill with any quarter inch screwdriver bit to wind the string up faster than hand winding.
I have put on over 300 feet of string on one of these with no problem.
You will need a 7 inch piece of 2 x 4 preferably a hardwood (I used a piece of scrap dunnage).
One quarter inch bolt (3 - 3 ½ in long).
One 5/16 inch threaded insert
One 5/16 inch bolt with the head cut off and nut.
One quarter inch screw bit adapter