i've had a sliding stop slip a bit.. plus not all my machines have a sliding stop. not all my machines have a conventional 3pt lift.. I do own other color tractors. ;)
I've also, (not mine) seen a lift stick due to dirty oil.
the chain method is just 100% fool proof.
true.. that a 3pt with all it's piece in place.. adjusted and operating at 100% is real close to fool proof. maybee 95%.. etc. that said. a couple foot of scrap chain and some scrap flat tabs that you can buzz and torch for free from the scrap pile is hardly worth a message post this long with people wringing their hands about it. I could have built a set of limit chains in the time it took me to punch this post in... anyone with a torch n welder and decent scrap pile could have. ;)