Also i have been successful in converting my flippers from leaf switch to optical boards on HS2. I had some issues on the right side and for now have needed to remove the spring metal, on the right flipper. It works 100% and if your like me and like that nice opto feel you can do it quite easy. All the details are in https://pinside.com/pinball/forum/topic/converting-taf-flippers-from-leaf-switch-to-optical-boards
free free to ask me any questions
you can see the right flipper button with issue, then without and then left flipper button.
20181215_202950 (resized).jpg20181215_205941 (resized).jpg20181215_203013 (resized).jpg