Lots of chainsawists here, I may be joining you some time, but first I'm looking for a simple way to put a chainsaw beyond use, without being obvious about it. I haven't looked closely, but I assume it's a small 2-stroke engine. Does sugar in the tank really work, and would it be easily diagnosed? Anything else that might be better?
The problem is, I have an elderly relative who clearly should not be allowed to use it. To my admittedly untrained eye, he's an accident waiting to happen. No training, no protective equipment, yesterday he was chopping up a loose heap of branches, slipping around on a muddy slope, using his foot to try to hold the logs in place and cutting right next to his foot. Of course he won't listen to criticism, he's been doing it for decades this way (though only a couple of times a year). Maybe so, but he no longer has the coordination or reactions that he used to. The saw is some small cheapish thing, no chain brake (at least, I don't think so, only got a quick glance at it), the bar works loose after a few mins use, etc etc. It's a poor starter so would not be too suspicious if it just doesn't work next time he gets it out.
The longer term plan is I'll get a new saw and PPE and maybe a little bit of training and take over. He has a bit of woodland so it needs a little bit of looking after, not major tree felling but clearing fallen branches etc (and we burn the wood).