Ready for extraction

Here's the hub, and on the left is my custom end cap extractor. I slide the brass spoke nipple into the axle end, then slide the extractor over the end cap. Install the four M5 screws finger tight then thread in the M6 drive screw and reef on it to pull the end cap off. The end of the M6 smooshes into the spoke nipple rather than chewing up the axle end.

Done