The Office of Bureaucratic Safety in their determination to stop us from injuring ourselves have introduced features to our favorite tools in an attempt to make them safety foolproof down to the level of the most inept and careless person who might be using them so we have chainsaws with chainbrakes for those who don't know how to deal with kickback and "operator present" throttle interlocks for those who walk around with a running saw where a twig might catch the throttle. I received a Toro trimmer and would you believe it has an OP lock out latch for the throttle? What dangerous situation could that possibly be there for? Are blowers next? They have engines and there are moving parts so there must be some inherent danger we should be protected from. Lawnmowers already have them with a vengeance, take your hands off the bar and the damn thing shuts off, wouldn't do to leave it running while you stopped to move something in the path, might get your foot under it in the process.