mx beach guy,
Contact Parker or your local dealer.
I had the same problem with my Spider/Sliders when I purchased my boat.
One failed (just like the photo) within 30 hours. The other would NEVER stay put. Like Brad V . . . it would slide all the way aft as soon as I was underway.
Parker replaced BOTH them for free (THANKS Parker!) and the replacements were of a different configuration.
So far they are still going strong and I have had zero issues with them since thier install.
Kevin G.