Bicycle Mechanics - Crank removal...am I doing something wrong? (pics included)

I'm trying to get these Shimano RSX cranks off with no success.
I've removed the crank bolts and am trying to use a Park CCP2 to remove the cranks. I'm removing the larger part of the crank puller and threading into the cranks by hand (tightly) and then threading the inner part of the puller through it. It gets to a certain point and then no amount of force that I can generate can get it any further.

Here are a couple of pics:
http://img135.imageshack.us/img135/2240/img4418vh6.th.jpg (http://img135.imageshack.us/my.php?image=img4418vh6.jpg)
http://img404.imageshack.us/img404/5346/img4421td7.th.jpg (http://img404.imageshack.us/my.php?image=img4421td7.jpg)

Now, am I using the right tool and method? The pusher pin on the end of the crank puller appears to fit just within the square. Do I just need more force? Or am I doing something really stupid? I'm scared of doing any damage so any help would be much appreciated.

Ok panic over, I've just managed to get one off so I'm obviously doing it right. More force needed then!

I would secure the large part of the puller with a spanner rather than by hand. Some chain-sets can be tough to remove and need considerable force to budge them.

yes, it looks like you have too large a head on the crank puller so the head is just pushing against the square hole of the crank, instead of the BB axle.

my crank puller came with two heads, try switching the head and try again

hopefully you didn't crack or bend the crank

Ok panic over, I've just managed to get one off so I'm obviously doing it right. More force needed then!

Yeah, it takes a lot of force to get the crank off. You might want to get a short cheater bar to help. About a foot of copper drain pipe works. 1 1/4" size I think. It's been a while since all of my bikes have self extractors;)

Cheers all. Success has been had. I couldn't find a cheater bar with a big enough diameter to fit over the crank puller handle, but I eventually got it with a few taps of the hammer and some vein popping effort!

Another thing to watch for is peening on the end of the press pin.

After lots of use in a shop environment, the end that presses against the spindle can mushroom, either increasing the amount of torque required for removal, or preventing it entirely. It can be a tight fit even without a burr. A few passes with a file to take the burr off makes it right again.

Greasing the threads of the removal tool will also ensure less torque going to friction.

yes, it looks like you have too large a head on the crank puller so the head is just pushing against the square hole of the crank, instead of the BB axle.

my crank puller came with two heads, try switching the head and try again

hopefully you didn't crack or bend the crank

I had a similar crank a few weeks ago. I discovered a 1/4" hex nut (7/16" wrench) fit in nicely to use as a "shim".

A Schwinn World Sport at the flea market a few weeks ago had the hardest stuck crank I've ever seen. We threaded the puller all the way down, put a wrench on, and cranked it until the threads pulled out of the arm. We then tried the gear puller to no avail. It didn't even budge it at all, just drove the center shaft into the threads on the spindle. As far as I know, the crank is still on the bike, lol. The only thing we can figure is that someone put the crank bolt in with an impact wrench. Even penetrating oil on the backside did not help. Amazing!,,,,BD