Hey guys. Thought I'd chime in about the Robart seals. It seems Jerry and I are on the same wave length. I have used them in the past as well and they work great. They are a two piece unit, one glues in a hole you create on the box and the other piece slides through the mounted part. On either end of the slide there is a hole for your linkages or clevis system. You will have a short linkage from the servo to the inside hole, and another from the outside hole to your steering. I am assuming only one, unless you use a dual linkage for the steering. The pieces fit together in a square shape, and are grey in color. Yes these are "old school" because I learned about them setting up boats 20 years ago, but they really do work. One thing I may add is add silicone grease to the slide when getting ready to use. They are still available at Al's in Illinois. www.alshobbyshop.com They are located by Mike Z's stuff on the pegboards that slide out (if you can make it there) otherwise Cindy can probably find them for you. Another testomonial, there is another guy in district 4 who builds boats (I wont say because I don't want to offend MIKE but they are nice WOODSTUFF boats) but he uses them as well for his customers.
My two cents
Garrett Randall