First, thanks to bbr for posting this mod. It helped give me a better idea of what to expect when making front suspension changes.
OK, so after I bailed on ordering from K-Speed (and before LL made his very kind offer to buy local and mail to us), I decided to do a tiny bit of digging.
Our forks are conventional 41mm Showa.
A quick search turned up these adjusters from SlingShot Racing (they sell in ebay and amazon):
NEW SHOWA 41MM CONVENTIONAL TELESCOPIC FORK CNC BILLET ALUMINUM PRELOAD ADJUSTER
I just got the adjusters in the mail yesterday and installed them immediately. I took them for a brief ride last night, but only to make sure things were ok. Today I tinkered with the adjustment a little (not a proper sag adjustment, just increased preload to see effects).
I highly recommend getting a set of adjusters (way cheaper from K-Speed; I just needed them asap and wanted a secure mode of purchase; if I'd had time, I'd have bugged LL to get the K-Speeds for me, which is probably what y'all should do
). After adding a good bit of preload, the bike doesn't dive like crazy when I merely let off the throttle, and steering/leaning is much more responsive. This thing rides like it's on rails! Even though I paid quite a bit, it was worth it.
Now, I could have just cut some new spacers, even in various lengths for "adjustability," but I think all the attempts to screw the caps back on against the fork rebound would eventually lead to ruined threads in the fork tubes, so I like this option of just being able to adjust on the fly. One could just cut one set of spacers, but I could also feel the stiffness in my arms a bit more, so on a long trip, I'll want to take the preload back out easily.
Here's a pic of them installed: