Any question answered...

Sorry to keep harping on, but I still don't really understand what I'd need to convert the disc to track use, if not Hed's own kit.

Thishttp://rover.ebay.com/roverimp/1/710-53481-19255-0/1?pub=5574889051&toolid=10001&campid=5336525415&mpt=[CACHEBUSTER]http://rover.ebay.com/roverimp/1/710-53481-19255-0/1?ff3=2&pub=5574889051&toolid=10001&campid=5336525415&item=151046454418&mpt=1626694

http://i.ebayimg.com/t/Fixed-Wheel-Hub-Adaptor-Converter-Correct-Chainline-Singlespeed-FIXIE-/00/$(KGrHqN,!i0E1NUp0BpVBNbqygUlf!~~_12.JPG

plus axle?

As the Surly Fixxer thread piece seems to only slot onto the splines for a freehub body, I don't see how that piece could be made to work with a wheel with a freewheel thread on.

I just bought one. appaz it'll give a chainlin of 46mm on a track frame with a 7 speed threaded carbon wheel respaced to fit centre. This is because its designed for geared frames. I plan on fixing this by adjusting the converter some how, but I'll need to have a look at it first to decide if that is possible, if not flipping the sprocket will get rid of 4mm or so offset I think.

I will attach it to the wheel with pleanty of torq and grub screws through the hub and adapter.

I have found axles from miche hubs most suited to the job. the axles are threaded most of the way and the bearings sit on screw on bits.