Mr. Pinball Tip:

Coils can be modified in several ways to provide a stronger or weaker coil as needed. For more strength, remove no more than 20% of the turns, or substitute a coil with a smaller gauge or less turns. For a weaker coil, add a resistor in series, which weakens by reducing the voltage, or substitute a coil with a larger gauge or more turns.

When substituting a coil, you can usually be safe to substitute within 2 gauge sizes, and 10-20% on the number of turns.
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