I made a set of DIY senn. high-end cables for my 580's, from the original connectors . . . without cutting them open and without adding an extra splice joint on to the cable. The came out real nice, however this takes real patience and care to get right. This is what I did:
01. using a small vice i gripped one of the connectors upright with the cable hanging towards the floor
02. i used small, long nose pliers to grip one of the pins
03. i slowly heated the pin i was holding, pulling driectly up on the pin with the pliers
04. the connector plastic softened just enough to pull the pin out, with the wire still attached
05. the original senn. wire was desoldered from the pin
06. steps 2-5 repeat for the second pin of the connector
07. the original senn. cable was removed from the connector
08. close fit adhesive lined inside, heat shrink was thread onto the new cabling
09. each of the two wires was thread into it's respective hole in the senn. connector
10. the pins were soldered onto their respective wires of the new cable
11. a small amount of super glue was placed on the lower half of the pin
12. using larger long nose pliers the the pins were fitted back into the connectors
13. the adhesive heat shrink was slid over the strain relief and the upper part of the new cable, and a micro blowtorch was used to seal everything up
The end result is a very professional looking job . . . you can't tell the difference. A limitation is the strain relief in terms of the cable diameter you can use. It fits relatively small cables . . . i had to cut away the senn. strain relief to use my favourite belden cable (my favourite signal cable period) in place of the original senn. cable. I am presently working on a fix for this. Hope this helps anyone else trying this mod.