What kind of screws did you use to hold up the track? Can you switch out those screws for ones with flatter heads that would allow your locknut to clear?
If not, you might be stuck with the original shuttlecar bolt. Figure out how to attach a eyelet to the bottom of that bolt.
I'm thinking a kind of long nut. One that can be threaded onto the bottom of the existing bolt AND threaded onto your eyelet. I believe it would be called a "threaded rod coupler", or a "coupling nut".
Pacific Fasteners in Vancouver had stuff like this for me (in stainless steel)
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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