Originally Posted by
BenFenner You are shortening the part that comes in the mail from Koni. You are not shortening the OEM strut housing. At least that is not part of the basic CSK process.
You might cut the strut housing for other reasons, especially when going with a new (lower) spring perch or much shorter springs. But there is no need to cut the strut to get your travel back in the basic CSK conversion and that is not the part that people have trouble wrapping their head around. You will experience spring bind with RM/Hyperco springs mounted on the stock spring perch WAY before you run into strut housing clearance problems.
This diagram is amazing, teaches in 15 seconds what took me an hour to understand.
To add to this, you're just cutting off the nub at the bottom of the part from Koni. Technically it's part of the "housing" but the nub doesn't house anything, it just has threads to be bolted to the bottom of the OEM housing once you jam it in.