Do what I did and convert your lawnmower to electric start !!!
Firstly remove the complete pull start assembly to expose the engine crankshaft nut. ( This may some require some metal cutting )
Now find a socket that fits it. Hacksaw off the drive end of a socket extension that will fit in your pistol drill chuck.
Now fit the drill to the extension to the socket to the nut, pull the trigger to spin and start the mower.
Please let me know if you succeed. Cheers, Vince
Vince
August 2010