Quoted from Timmah:Oh, sorry - where I said EOS, replace with opto
(actually, can apparently edit myself)
It has been a while since I've worked on a pinball machine. I did a bit when a first bought it and really nothing since then until a week ago
That's okay, apparently my phone likes to correct "problem" with "offsite"..
In either case, if both flippers activate with out issue, no need to worry. You can clean them, but optos are either open or closed - and the bottom flipped should activate first.