Thanks for your posts! I'm going to be attempting this as well in the next couple of days and your post will be extremely helpful. I purchased the older model Bull Rings that sit over the plastic rather than flush. Hoping those will cover my cuts...I hate posting after myself again, but I got my stake pocket tie downs installed tonight. First, the router bit stated it needs to be exposed 13/16". When I went out to go cut the first hole, I checked and the bit would have barely been cutting anything. I exposed it to 15/16" and it got almost everything. Another 1/32" probably would have helped, but it wasn't necessary.
Using the covers from the rear holes, I scribed where to cut with a straight pick from a pick set. Then I used a utility knife to cut where I marked. I needed to do a little trimming, but once you're through, it's pretty easy to cut. I plan on getting something to seal around it and clean up the look of the edges, but it turned out really well I think.
