Thx guys for your quick feedback.  I have adjusted the eos trying to stop the chatter. Looking at the other flipper, which is working fine, they look exactly the same. I understand this cant be.I will keep trying. I suppose another thing which is maybe worth mentioning is that coil that I changed over has a different lug layout. The old one has 3 lugs top to bottom with what looks like the common in the center, a large and a smaller coil, main coil and secondary im thinking?. The newbie has three lugs across the top . Assuming the middle is still the common, The left and right was an educated guess based on the lay out..Maybe I stuffed that up and this is causing me heart ache. Life was simpler before pinballs :)