I had one of those Crank Start Mowers until the spring went part way through the housing. Took it off and used a rope. Until I figured out a belt drive using an electric mower and an old fan belt
Here's another windup mower... This time on a Briggs motor..... https://youtube.com/shorts/fFS3Jtv0Mso?si=JWY36VShNg8Gfykx