On the subject of flippy caps, they do go bad, just replaced one yesterday, and there is a bit of a learning curve with em, but I've grown to like em, once you get the hang of how they lock, they stay locked.
The old screw caps had a habit of coming loose when you didn't torque em down...
Another downfall with the old screworld on caps is it was to easy to poke a hole in them when tightening them with a bar wrench. Most of the time they held just finger tight though.
Not trying to permanently derail this thread, and maybe it is just a McCulloch thing, but it seems everything that screws on by hand takes a tool to get off and everything that screws on with a tool falls out on it own. Ron
Oh boy time to do a little hand falling in 25 year old timber that was preconned already thank god, wish the harvester hadn't of blown the hydraulic pump.