This might work for other Rock Shox forks too…
My new Pike’s steerer tube has a cap in the bottom with a threaded hole the same size as a standard headset bolt (M6). Instead of pounding a star nut into the steerer, it’s exteremely easy use this cap as the bottom of a headset locker like the Azonic Headlock or USE Safe-T.
Required parts (in addition to headset, stem, spacers, etc.):
M6 threaded rod (shortest I could buy was 3 feet)
M6 coupler nut
Total cost about $5.
Insert the rod to measure the correct length. I threaded the rod through the bottom of the steerer tube until half an inch or so was protruding out the top of the tube. This took some time to thread the 10″ of rod through; I could have done an initial cut to an estimation of length to save myself some time, I suppose.
Add coupler nut, headset cap and original stem bolt. Thread the nut on the rod first, headset cap on original stem bolt, and then stem bolt into the coupler nut as well.
Tighten down the headset cap so there is no play or extra space in the steerer stack. Mark the point where the rod emerges from the bottom of the steerer tube. Take it all apart again, and cut the rod at the mark with a hacksaw.
Put it all together with the headset cap back on original bolt, coupler to original bolt, then threaded rod into coupler. You may want to use some removable threadlocker on the coupler to make it behave more like a single bolt when it’s in the steerer. Tighten the original stem bolt tightly into the coupler; it’ll butt up against the threaded rod.
Drop the whole thing into the steerer tube, thread it into the bottom cap, then tighten the bolt to the torque specs of your headset.