I'm using a chainsplitter that looks very like the above one. I'm not sure if my chain link is particularly stuck but it seems almost impossible to get enough torque to get the pin out. The shape of the tool meant that I could hold it with an adjustable spanner and then hit the other arm with a hammer until I got it to turn. On the way back in I had to resort to using the claw end of the hammer to twist the handle (still holding with adjustable spanner). Is this par for the course, or is there a certain knack to this? I'm sure the last chain I joined was no problem at all!