I'm part way through my replacement of broken studs on my 911sc 204bhp model, and have removed the cylinders with pistons still inside - wasn't sure if Nikasil or Alusil at the time so didn't want to disturb them too much. I have since found out they are Nikasil
One of the pistons came out of the cylinder, so while it was out, I checked the rings and they are within tollerance, so I was planing not to seperate the other five. All cylinders look good. Here is my first big mistake ! Using a cheap

ring compressor i managed to break the lower ring. I have a new set on order, but will I be ok replacing just the rings on this piston an leaving the other five as they are ?
Would I be best replacing all the rings on this piston, or just the broken one ?
Thanks