As I've mentioned a few times, my '97 MT Jetclean was a portable and when I remodeled my kitchen I converted it to built-in. I'm in the process of reworking it and want to make it portable again. I no longer have the counterweight, nor do I remember how big it was. Can anyone tell me how much weight I need to put in the back? I'm pretty sure I remember it being a concrete block of some sort.