It is fairly easy to make these in a short time. You can start with the braided spectra cord that is used for chicken loops (I have forgotten the trade name for this stuff, anyone?) or you can use something around 1/8 inch or slightly larger braided nylon cord.
Take the two pigtails (front and rear) off your kite to help you with line dimensions and knot placement. The kook proof connectors will replace your pigtails. The following photos are of some spare kook proof connectors prepared for Best kites. Dimensions and number of knots will vary with other kites. It is good to color code all the connectors for the left and right hand sides of the kite respectively.
These dimensions apply to the 2004 Yarga and Nemesis but may vary with other kites.
You will tie several of these overhand knots.
Resulting in two of each type of connector. You will need TWO sets of the four connectors shown (one set for the kite and the other for the flight lines). NOTE: the knots should appear at the SAME distances on your homemade Kook Proof connectors as on your factory pigtails.
MAKE SURE you use one type for the front or leading edge pigtails and the other type for the trailing edge. Run your lines out, separate them and connect the appropriate kook proof connector.
For the kites that I have owned, it is best to put the connectors with knots at the trailing edge. This allows you to trim the kite power for actual wind conditions. The looped connectors are attached to the leading edge.
It isn't that hard to do. PLAN to change the connectors every few months, particularly if they are made of the weaker nylon line. Remember hearing about guys who have three to four lines detach at one time before? Weak pigtails are often the cause.
What other approaches do people use out there?