General Tips & Troubleshooting:
1) REMOVE the thin black (conductive) skin from around the white insulation. If it touches where the conductor needs to enter, you’ll create a complete short or partial short with weak signal
2) Attach the first plug to your longer supply of cable before cutting to length. Measure length required to the other plug. Cut, attach the second plug to complete cable. Attach next plug to long supply of cable. Rinse. Repeat.
3) You need the cable to slide in completely with a snug fit. If you have trouble pushing the cable into the plug, don’t twist the shield as much.
4) Wear rubber gloves to get a good grip when closing tight. I can close 10 quickly without complaining. So can most guitar players. More than that you might want those gloves.