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On older sets you may want to spray some solvent (rust buster, WD40) in to the coils and let it soak in. You sure do not want to strip or break the cores. Another tip is to place a metal allen wrench into the core but DO NOT TRY TO TURN IT. Then take a soldering gun and apply heat to the wrench. Let the heat travel into the core. Let it cool, spray more solvent and repeat with the heat. Convergence on these sets took about 10 to 15 minutes once you have the hang of it. After the center is done, red and green vertical and horiz. Then left and right.Then blue on top of that vertically and horiz followed by blue left and right. If something did not move, change the diode block.
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