Hey Yall. I'm new so bear with me. I have an older Toro walk behind. Model #: 30178 Serial #: 240000403 I was using this on a bank and the mower got stuck. Went to go get one of the other guys to help me pull it up and while I was gone it shut off. After shutting off I can not pull the cord to start at all. Extremely hard. Had and still does have plenty of gas. I have pulled the pull cord off down to the flywheel. Before doing so I removed the spark plug and tried to turn it over without it in. Still stuck as before. I'm at a loss to what it could be and where to go from here. Any suggestions would be greatly appreciated.