Been through this a dozen times,
BEST way to do it without SCRATCHING the hell out of your chassis is, clip the old cord as near as possible to the old pain-relief and pull it out.
Heat up a solder gun and carefully melt it out, you'll be able to pick pieces out as they cool
(so you don't burn your fingers) works for me.
Make sure you have some ventilation or do it in the garage, gets a little stinky.
You can replace the pain-relief with a rubber grommet of the appropriate size from a hardware store, Lowes or McMaster Carr.
BEST way to do it without SCRATCHING the hell out of your chassis is, clip the old cord as near as possible to the old pain-relief and pull it out.
Heat up a solder gun and carefully melt it out, you'll be able to pick pieces out as they cool
(so you don't burn your fingers) works for me.
Make sure you have some ventilation or do it in the garage, gets a little stinky.
You can replace the pain-relief with a rubber grommet of the appropriate size from a hardware store, Lowes or McMaster Carr.