Good and timely topic, at least for me. I am in the process of testing 042 switches for a layout build. I have accumulated several used versions of these over the years. Now that my Mianne order has been placed I am trying to figure out which switches work and trying to tweak the ones that don’t. It can’t get a bit frustrating but I’m making progress. I will create a post on the O/027 forum about one that has me stumped.