the nature of broken hearts

They are all breaking...

I can pinpoint certain conditions and outcomes. I think I can narrow down some specifics... and I have ideas to try for the next time.

As for the cement... I recommend at least 9 minutes of mechanical mixing, I will try 3 slush casts with mixing and perhaps tapping but I will have to see on that one... not more than 30 sec. over night heating @ 100. Do not be impatient.