That was not a good idea.

Today I attempted to harvest castings from my worm bin that I built. (See earlier post). I could not move the rake. The weight of the worm dirt/castings was too much to allow the rake to slide to or fro. So whatever you do, do not copy what I did.
So, I removed all the worms and dirt, removed the rake, and put a layer of fine screen on top of the grate that was already installed. I then returned the worms and dirt to the bin. I had copious amounts of worms and some castings, but not too much. I plan to use the bin as is and simply manually harvest the castings once or twice a year. O well, you live you learn. By the way, the bees were happy today, lots of sunshine, solar panels produce 29 kwH today.