HOw do you rewind the coil on a toro lawn mower handle? I took off the assembly and the coil unwound. I cannot figure out how to rewind it.

Hi,
Problem is you did not specify engine brand on mower. On the off-chance it is Briggs, there is a YouTube video.
Briggs and Stratton Rewind Spring and Pulley Replacement (part #498144) - YouTube
This will not work for a Suzuki engine.
Peace,
Clarke