Hello everyone, After a long time, I've booted my Apple II again. However, it seems that some keys on the keyboard are not always working. I can get some to work by pressing quickly & hard a couple of times. Before I'm going to pry open the keyboard, is it "normal" that these keys don't seem to make contact? Also, I forgot the name of the recently discovered old case cleaner material, does anyone know this? Thanks in advance!