Loose front subframe to chassis bolts.

[turbo_dreams]

For some odd reason, i find that my front brace where the rad support/tension arm connects to, is loose from the chassis of my car. There's 2 bolts and 2 studs that hold this onto my frame, 1 of each per side. I dropped my tension arms, lined the holes up, and put bolts/nuts in all four. Week later, i find my driverside of the brace once again became loose. I'm planning on dropping it once again this sunday and replacing the bolt/nut, any suggestion other then crush washers/locktite to keep them from comming loose once again?
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Just in case anyone needs a visual of what piece i'm talking about...

http://www.sillbeer.com/images/chass...race-place.jpg
No i do not have the nismo brace. The bolt/nut i'm referring to can be seen in this pic.