How do I safely adjust the spark gaps on the Miller Electric Syncrowave 250?
Turn off power before adjusting spark gaps, open the access door, loosen adjustment screws, insert a gauge of proper thickness in the spark gap, apply slight pressure until the gauge is firmly held, tighten screws, and adjust the other gap. Close the access door afterward (Page 30).
From the official Miller Electric Syncrowave 250 manual, page 30
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