Quoted from gmkalos:Well the coil windings shrink over time essentially choking the plunger, just replace the coil and sleeve at least man there like $10 at Marco!
Nope. Maybe on a sub-atomic level, but not measurable in the real world. No need to replace the coil, just the sleeve. The sleeves after many, many years just get worn out, brittle, crack, get dirty from age and repeated use.
Quoted from gmkalos:I remember hearing something about the plastic sheathing on the copper wire over time shrinks from the heat, basically tightening up the windings on the spool? But that would make sense heat in general.
The wire in a coil has no plastic insulation on them, just varnish. Motors and transformers have has this on the windings since like...forever. Some are still in operation and are still the same size for the past 100 years and haven't shrunk.
Quoted from gmkalos:I think it's hit or miss, I've played on original flipper coils on well taken care of games from the 70's and back. I always cringe when someone holds a ball taking there sweet time lining up a shot even tho I know that eos is there lol.
Yes, the EOS is there to turn off the high power winding and turn on the low power hold winding. Unless the person traps the ball and then takes an international phone call from a lost family member, I think the coil will be fine. Yes, if your EOS is not adjusted properly and doesn't open at end of stroke, you'll have issues; but usually within 10 seconds and you'll definitely smell the problem.