Check out mine, I used an old carphone hands free mic to hold it in place.... and its super easy to pull down and put back up. You could even use velcro attached to the plastic trim adjacent to the visor if you dont want roof cloth issues, its easily close enough.
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Chris
"A person convinced against their will, is of the same opinion still"
New?? Find the downloadable SVX Online Service Manual
Here
RECOMMENDED READING for newer SVX owners
Here some cool info if not fully accurate.