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I don’t prepare them at all, I’ve had no problems with them. The precut wires that come with the 50K’s fit perfectly in the tiny little holes. Then I bend the wire down and touch it with a spec of thin rosin core ( also supplied with my chip ) on my iron tip. Works great. I thought I might need to stick the wire in flux to draw the solder down into the hole but so far it’s been bonding great. If you frig around with fiberglass pens you'll just fill the holes with junk and end up with less surface for solder to bond to.
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