So, I have had two lawnmowers in the past - each one lasted over 10yrs. The last mower I had, my nephew ran it over a rock and bent the drive shaft - I still used it for the rest of last year since rattling noise wasn't as bad and only does that when I disengaged the blade.
However, this year when I started it back up to prep for the summer... the rattling was way worst than last year without the blade engaged. It was very loud and the mower was shaking like crazy... I need to either repair it or replace it. Since, it's old and parts are probably hard to find, I opted for a new replacement.
I went online and ordered another Toro (model 21565) from Lowes for $750+, waited 2 weeks to get it. Put it together and started it but as soon as I disengaged the level, motor stop. I was like... WTH!!! Why did it stop? I thought only the blade is to stop but the motor keeps running. I thought something was wrong with this new mower. Went online to do some digging... Found out that only some models have the spin-stop or BBC (blade brake clutch) feature and majority of them don't. The spin-stop is a feature that allows you to disengage the blade but the motor still runs - so, you don't have to stop/start the mower every time you need to pick up an object or go over driveway, sidewalk, etc etc and don't want the blade to keep running.
Since, my two previous mowers had the spin-stop feature (I didn't buy them for that reason - just happened to get them like that), I thought all residential mower has that as standard. The new mower I bought didn't come with that feature. So glad, Lowes was good with in-store return even if bought online. And I didn't need all original packaging - only the box and as much gas as I can drain out of it.
Story short... I went and bought another Toro (model 21468) for $690+ that had the spin-stop feature at another store (Acme Tools) - the only place I can find within a 2hrs drive that had that model stocked.