Getting the thermistor in was rather fiddly, making sure the sleeving didn't slip out. My first attempt didn't go so well - you can see one of the bare wires:
I retried and got this, which looks acceptable:
Assembling the rest of the E3D was pretty easy, but mounting it showed a bigger problem: The E3D mount is a lot bigger than the J-head: 16mm wide with 12mm groove width, where the J-head is 10mm wide with 8.5mm groove. The hole in the extruder is 10.5mm.
I thought I had done my research properly, and indeed everything I find says you can mount an E3D on a Wade's Extruder. The reprap.org Wade's extruder page makes it sound like it's a 16mm hole, so why is mine different? Is mine a weird mutation on Wade's? I got it from reprap-fab.org, but when I go there now, a) my order is no longer visible, and b) the item with the same name is entirely different - it has a similar-looking hotend, though. I don't think this is an early J-head after all, but some other piece
Regardless of how this came to be, I now have a crappy hotend that fits my extruder and a shiny new hotend that doesn't. This leaves me with three choices:
1) Try to get/make an adapter (but that could make the assembly too long for the fan duct +Thomas Riedl so nicely printed for me).
2) Get (or have someone print) a new extruder (part).
3) Get a hotend that fits the existing extruder.
