It might be that your saddle rails aren't a very good fit in the clamp as well. I know i had an issue with this - the movement would tend to loosen up the clamp, but a bit of aluminium tape to make the rails a bit wider diameter got rid of that problem
It might be that your saddle rails aren't a very good fit in the clamp as well. I know i had an issue with this - the movement would tend to loosen up the clamp, but a bit of aluminium tape to make the rails a bit wider diameter got rid of that problem