On Oct 25, 1:11*pm, wrote:
On Mon, 25 Oct 2010 08:02:14 -0700 (PDT), Frogwatch

wrote:
I spent a huge amount of time trying to come up with some way to keep
a boat *centered between two pilings as the tide went up or down even
for storm surges. *Thought about all kinds of mechanisms that kept
constant tension on the lines while allowing it to lengthen and then
shorten. *THEN, somebody else thought of something really simple, an
idea I admire. *It is simply balls with holes thru them threaded onto
the line that goes around your pilings. *They roll up and down the
piling as the water rises and falls. *I cannot remember the product
name, does anybody know it? *Has anybody used it?

The tide minders work OK if you have clean pilings but they don't help
much on the dock side or if they ever drop below the barnacle line.

They will not roll over barnacles?