Each persons requirements or needs are different, generally speaking the lead with the rod holder should be about 10 foot longer than the ground lead, as the ground is just clamped on to the work and the rod holder lead has to be capable of moving around the work in different locatons.
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Irnsrgn
Knowledge must be shared or it lies dead in the mind.
The Blacksmith must use Hammer and Flame to force the iron down the path of his own choosing.
I usually find it much easier to be wrong once in while than to try to be perfect.
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