A hard stool wouldn't fall to pieces after 5mins sitting in the toilet bowl so why would it in the bowels if you added water. Maybe if you inserted warm water an left it for 30mins + then maybe it would work i haven't tried it so I'm not sure. Its just a thought but makes sense it took 24hrs to compact will take awhile to decompact. Plus stool is kinda greasy so warm would be better then cold.

funnily enough I had this exact same problem last week which caused me to sit on the loo and cry. I was at work, in a cubicle and hadn't pooped for 3 days, it got stuck and knew I wouldn't be able to get it out without causing damage as I could feel my butt at breaking point. I had to manually evacuate some of it eventually (the shame) and then poop the rest, my god the pain was there and was awful for days after. now I dilate every day, and also use some scar oil I found online and that's cured it. Also, to prevent the stool sticking and being hard drink plenty of water (start the day with a warm water to start your peristalsis (gut movement)). I also have a bowl of bran every morning topped with ground flax seed which helps hugely. Have a look on my diary for my long story x