I thought you meant cutting the wires in half or so to reduce the wire length but you removed the connector on the end and soldered a male header on. I understand now.
You can get the ADXL345 working right now! No need to the logic converter. I'm using them in my project. See http://bildr.org/?s=Adxl345
where the Adxl345 is powered by 3.3v on an Arduino running at 5v. The library link on that site is too big so grab the library at the Adafruit site. They just created a new adxl345 breakout board and have a smaller, tighter library. You will also need another sensors library to go with it. I can send you them if you have trouble.