i looked and looked but could not find the 17mm hex upgrade kit. Man I wish i would have ordered it a year ago when it was available for $16! So i ordered BS936-003 that is the 17mm hub itself, it comes with hexes, and ordered the BS936-004, those are the stub axles that accept the 17mm hub. I ordered from a certain online place because they were the only ones that had everything in stock. Wrong! After i ordered they informed me that 3 of the 4 stub axles are back ordered, they said the wait will be 2-4 weeks! I wonder why those stub axles are getting so hard to find? Are they not making very much of them? Are they so popular no one can keep them on the shelf? I can't wait to be able to run wheels with 17mm hexes! Hopefully i can turn the punch up a little then.