Clean that EOS switch's contact on the chattering flipper. If that doesn't help, do a search under chattering flipper or chattering coil.

Best of luck.

Which machine is that?

Here is one thread about it:

http://pinside.com/pinball/forum/topic/system-11-help-asap#post-194145

Its has a bad broken wire on the coil same thing happen on my bad cats.

Yes, as mnpin wrote clean that EOS switch and adjust...sometimes you can use that 'big blue spark' you see in vid when flipper operated as a clue it needs adjustment/ cleaning. Also if not cure, check where the coil winding wires attach to the lugs for broken wire or coil lug....usually the thinner wire is culprit. Good luck.

The smaller hold wire, to be exact. Likely nothing to do with the EOS switch.

As mentioned above, you likely have a broken coil wire. Look at the coil closely and find the two lugs where the smaller wire coming off the coil connects to the lugs. One of the two ends has likely broken. You can either resolder the wire, or replace the coil. If you do resolder the wire, make sure enough insulation is scraped off so that you can make a good connection.

This is what you want to look for. The thinnest wire coming off the coil, and/or any wires that connect to that lug. You may even need to take off the wrapper to find it.

Edit: ^^^what phish said^^^ I think we might have posted at the same time

You sure the replacement coil has the same specs?

If nothing else you can swap the left and right coils to confirm that's the issue

Hard(for me)to really tell from vid but...is there a 'rubber' on the PC. Of metal that opens the EOS switch on the left(as you look at vid)and NOT not the right that's in question? Also, make are that EOS switch contacts are really clean and adjusted properly. Almost looked like the screw that hold the flipper pawl in was hitting switch...hard to tell from vid. You should have really good contact before switch opens and then that switch (EOS)should just open at the end of flipper stroke. I believe the cleaning and adjustment of that EOS switch will get you back in action. Please post back w/results. Good luck.

P.s.....that switch has been arcing for a quite a while I think(burn mark on plate)....look closely for pits int the contacts also and file smooth w/metal file. Give it a good cleaning and adjust and I think you'll be back in action! (Famous last words : )