TT85 crashbar btm bolt.

I need to access the oil pressure sensor and to do so need to undo the bottom bolt that partially covers the torx screw. The cap head 8mm allen bolt just keeps turning and does not appear to move out from the crankcase. It will retighten no problem. I would like to know if there is some sort of insert or captive nut in there?

The bolt goes right though engine with nut on other side!

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Does it only attach the crashbars, or is it also the bottom frame fixing points?

Just a long bolt through engine holds both crashbars. I had to remove crash bar to get at oil sensor, new one fitted and all fixed.