You need to call Pivotrim 1-866-212-7466. Apparently you need a different adapter (gray not black) to install on a FS-40.
sthilweedeaterhead number f5556
It depends on your model. You can visit the PIVOTRIM website and they show how to install their head on most units which includes how to take your old one off. Their website is http://www.pivotrim.com Otherwise you need to look at your operators manual or call the manufacturer. Good Luck!
There's either a steel or flexible shaft inside the tube between the engine and the head. That shaft is broken. Or if it's solid, it rusted inside the head
The manual can be found at the link below.
stick a flat head screw driver in the slot above head and turn counter clock wise.
remove head pull shaft out
Home Depot, Sunkist, Stihl are among the few I can name off the top of my head
prie the blocker for the release line rate off, then just unscrew the bolt
bearings in the the gear head damage or running dry need grease or replacement
Put both strings in those designated holes at the same time (unlike Stihl) and simply twist it right-left. (There is an indicating arrow.) That's the hard part. Next, stuff it in the encasing put it through the gider holes, then make sure it is all the way down in the encasing. Lastly, pull the string taught and this should pop it out of the inside gider holes. I've put lots of hours on weed wackers and I must say I am sorely dissapointed in kawasaki. It is one of the most horribly engineered pieces of equipment in my opinion. For instance, no matter what I've done in replacing this trimmer cord, there is ALWAYS problems feeding. I've even had "professionals" put it on. If one is smart, they'd stay in the same money bracket and go Stihl. Seriously, there is no comparison for ease of use, durability, engineering, etc. I HATE my kawasaki products. I bought them to support a local store. Choice gone awry. . .
On most of them you hold the top part with one hand and turn the bummer/spool clockwise (looking from the top)and pull it straight down/outward
The 2012 Tesla Model-S has 36.6 in. of rear head room.