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Friday 20 April 2018 at 20:16
Like others have said: a crispy coil might look bad, but will still do the job if its resistance checks out. That said, here are two practical concerns:
(1) The nylon base becomes brittle and is prone to snapping apart when handled. I definitely replace the entire coil when that happens.
(2) The lab...
Source: http://pinside.com/pinball/forum/topic/crispy-coil-question#post-4351470