Bought for my old Lincoln Pro-Core 100, the old gun wires in the cables broke down over time from flexing. There was a Weller gun/cable. The new block didn't come with any instructions that I saw, but it's easy to understand. The only issue I had was the trigger connector wires were too short and didn't reach where I needed to connect them to the welder. I just cut the wires off the old gun and used insulated quick connects with teenagers when needed. My old gun was so bad I couldn't weld anything over B. And even then it was hardly possible. I was able to weld to C with the new gun without any problems, and I am very satisfied with the performance so far.
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