Just my 2¢---
Get a new spreader and leave it alone. After all of these years, there's still nothing wrong with that kite the way it was originally made. If it's not doing something you want it to, or if one of the mods/upgrades addresses an issue that you may be having, then by all means, go for it. Otherwise, why risk messing with a "go to kite" right before vacation?
Good luck whatever you decide.