Rivnut tool.
Good quality nut and bolt. little bit of thin flat plate with right size hole in it
Put the rivnut in, plate on top to stop rivnut turning.
Screw bolt in (With tightning nut attached)
Then holding plate, tighten nut, till rivnut is secure
I'm using 6mm bolts to hold my scuttle (3 each side)
and nosecone (2 each side, 2 in bottom flange)
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David.
Heaven, Warm days and Cool rides 
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