Originally Posted by
repechage
I am pretty sure CV-6's seatpost uses two bolts, the nuts are inside and face each other.
To get mine sharpie pen tell tale secure, I had to lubricate the threads and really really torque down on the bolts.
Photo below of the seat clamp.
I do have a Simplex post that is as you describe. It works fine.
And a correction. The saddle is a 2001. Not that it makes much difference for the issue.