One of the best tutorials we have seen, why reinvent the wheel. This is a great way to string your sidewalls, from a player on Lacrosse Forums called "Orange".
1. The Basic Interlock
Put the sidewall string in the hole then put the string OVER the diamond of the mesh (as in threw diamond on the opposite side the ball will rest).
Put the string into the next sidewall hole just like above.
Pull the string through but not all the way. Then take the string and put it under the little formed loop.
It should look like the above picture. Start to pull it.
Pull the string as tight as you can, especially since it's the first diamond, you want this one very tight.
For the next diamond, it's basically a repeat. Put the string OVER the diamond again.
Put the string through the next sidewall hole.
Put the string up through the little loop then pull.
Pull the string tight again. It doesn't have to be super tight from here down but it can be to your preference.
Repeat for the next diamond.
2. Doubling Up
Now you're going to want to double up to create a bigger pocket.
You want to put the string UNDER the diamond and pull it up.
Remember, UNDER the diamond.
Next, put the string OVER the NEXT diamond and then through the next sidewall hole.
Next, put the string under the loop created and pull.
Pull the string nice and tight (or tight enough) so that it looks like the picture above. Notice the diamond not interlocked. That's what doubling up looks like in interlocking.
Repeat the doubling up steps for the next sidewall segment.
Interlock the last diamond then put the string through the last sidewall hole.
Tie the knot then repeat SYMMETRICALLY on the other sidewall.
Congratulations you have just learned how to interlock sidewalls.