I'd saved only the chargers and batteries,
when the 4-foot tidal surge from Hurricane Irma wiped out my Ryobi portable drill collection.
But moving on...
I've had many occasions to drag my Sunfish
hither and yon: occasionally over sand, but mostly over grasses of varying lengths and fiber. While a heavy line attached to the bow handle helps, I've added a nifty gadget known as a
snatch block to the drag coefficient.
Why they're so expensive to buy, I don't know. For free, I've rescued two from
come-a-longs I'd over-revved—and had to throw out. (Also known as
cable winches). Wrapping the hook part with electrical tape or shrink tubing will preserve the finish on the bow handle.
Attach one end of your towing line to a tree, run the line through this block, and you've reduced the physical effort of pulling a Sunfish a great deal!
Run out of line before moving the boat? Find another object, like another tree or a boulder to attach the line to. Rinse, repeat.
and adequate for most home power tools, there's always one at hand. Be gentle with them, as the ear pieces are loosely bedded in rubber parts, plus, the headband can be broken. 
I repaired one with steel banding—wrapped with string, and epoxied—but could have replaced it with much less effort. 
One loosened up, but got tightened with a steel punch strike to the center pin. 
