D130 bracket loose and wont tighten

I was greasing the required fittings on my D130 for the first time. The fitting for the Front Axle Pivot was blocked by the Front Draft Rod. I loosened the bracket (on the frame) to allow it to swing out. After greasing, the nut (apparently a nylon lock style) will not retighten because the bolt turns. There is no visible access to the bolt head. I didn't want to just start taking things apart to gain access, if access is even possible. Advise?

The bracket is separated by about 1/4" at the most. I don't think the bracket is in danger of falling off, but it will swing side to side when force is applied.



Thanks,

David