I have somewhere here the result of a lady hitting bloody big rocks several times (rental only mows when knee high) with a sprinter - 3rd time, pull cord wouldn't retract. Flywheel blew the entire centre out - will try to find it and take a photo - just a nice roundish few inch hole in the middle.
That was one of the last flat head 450s though
Mowed with my PT commando last weekend - 3 months sitting, 3 primes and went with 1 pull. Says something about quality.
