Repeating my comment from the other thread, the cam extractor looks good for a cam that went slightly out of reach into the crack. The pitch above the Harding Slot on Astroman sometimes has #.5 Camalots pushed deep in the initial overhang if the leader weights the rope higher.
But usually when I see a stuck cam, one or more of the cam lobes are "locked up", and just being able to pull the trigger bar is not enough to free it.
The cam extractor might also be used like a "stick clip" to place a cam high on a route with a hard start where the crack is out of reach. I can't think of an example at the moment, but I'm sure there are a few.
I agree with you Clint, when the lobes are locked up it makes it pretty tough. You would be pretty surprised by the amount of cams that I have seen "rescued" by one of these devises though. Given the price of cams, it can be a handy little device have around. The cam-extractor was designed with two purposes in mind, being able to extract cams that have walked too far into a crack and to extend one's reach (as you pointed out). We are just launching the updated version of this device so your thoughts are definitely appreciated.
If the cams aren't moving at all it's time to hammer on it. But before resorting to that, my technique is to keep tension on the cam by putting a sling in my mouth, then see which cams are stuck work on them with nut tool, if you can get them to move at all, you're pulling with the sling so the cam should move a little. Before doing this though, you need to retrace how the cam got to where it was and remove it the same way. You may be trying to extract it through a narrower space than where it was inserted. If you have to use force, then don't worry about damaging the trigger, it can be replaced. That's all I have to add.
No hammer needed, but a tire iron works well to unstick the lobes.
Or a long screwdriver would be a lighter tool, though it's a little easier to generate torque with an angled handle like on the tire iron.
My partner likes to bend a screwdriver to make a cleaning tool, so that could be a nice combination for this purpose (if the bend was near the handle instead of near the blade).