Tried a few of the Pi Pico cases that were out there and they didnt work for me.. So I designed one that works.

The case was designed around using a Panduit Corp Ethernet patch cable.. It's 4mm in diameter.

Cut one end off and solder the wires to the Pico. Wiring can be found here: https://klipper.discourse.group/t/raspberry-pi-pico-adxl345-portable-resonance-measurement/1757

Then you can either cut the other end off or get a Ethernet break out PCB like the SparkFun Electronics BOB-00716 and use that to connect to the ADXL345 board the one I am using is a SparkFun SEN-09836.