Hello friends. I was wondering if anyone knew a solution to a problem I'm having. I have a 1974 Williams Skylab EM pinball machine that I purchased recently. The guy I got it from did tell me that the left flipper seemed weak sometimes although shortly after I tried playing it the flipper was constantly very weak compared to the right flipper. After inspecting the assembly I noticed that the left flipper coil had been replaced. The number on the old coil on the right flipper is FL20 28-400. The number on the new left coil was FL20-300/28/400. I'm wondering if this is the right coil for this machine as the number isn't exactly the same as the old right coil that's original to the machine. If it is correct then why is the action of it so weak. If I try to hold the right coil plunger mechanism when I activate it my hand practically gets ripped off. If I hold onto the left flipper it buzzes and is quite weak. Any help in figuring this out would be most appreciated.