I tried a Hotknife, but it would not cut away the part. I had already tried isopropyl alcohol, and then Acetone. I wound up using a Dremel power tool with a Cutoff wheel. A little Smoke, crap flying around, and sparks, and I was able to remove the bad part. In my case, the laptop survived the surgery. I was able to replace the power adapter and screw the new part in place. I now have a fully working Inspiron 3147 laptop, for the price of a $10 part . I would only recommend the Dremel if you have nothing to lose.